diff --git a/addons/web/static/src/boot.js b/addons/web/static/src/boot.js
index fc42d8108af..707c0ec0a41 100644
--- a/addons/web/static/src/boot.js
+++ b/addons/web/static/src/boot.js
@@ -32,6 +32,7 @@
     var factories = Object.create(null);
     var jobDeps = [];
     var jobPromises = [];
+    const failed = [];
 
     var services = Object.create({});
 
@@ -75,41 +76,23 @@
                 });
         },
         getWaitedJobs: function () {
-            return jobs
-                .map(function (job) {
-                    return job.name;
-                })
-                .filter(function (item, index, self) {
-                    // uniq
-                    return self.indexOf(item) === index;
-                });
+            return new Set(jobs.map((job) => job.name));
         },
-        getMissingJobs: function () {
-            var self = this;
-            var waited = this.getWaitedJobs();
-            var missing = [];
-            waited.forEach(function (job) {
-                self.getDependencies(job).forEach(function (job) {
-                    if (!(job in self.services)) {
-                        missing.push(job);
+        getMissingJobs() {
+            const waited = this.getWaitedJobs();
+            const missing = new Set();
+            for (const job of waited) {
+                for (const dep of this.getDependencies(job)) {
+                    if (
+                        !(dep in this.services) &&
+                        !waited.has(dep) &&
+                        !failed.find((job) => job.name === dep)
+                    ) {
+                        missing.add(dep);
                     }
-                });
-            });
-            return missing
-                .filter(function (item, index, self) {
-                    return self.indexOf(item) === index;
-                })
-                .filter(function (item) {
-                    return waited.indexOf(item) < 0;
-                })
-                .filter(function (job) {
-                    return !job.error;
-                });
-        },
-        getFailedJobs: function () {
-            return jobs.filter(function (job) {
-                return !!job.error;
-            });
+                }
+            }
+            return [...missing];
         },
         processJobs: function () {
             var job;
@@ -120,6 +103,7 @@
                 var jobExec;
                 function onError(e) {
                     job.error = e;
+                    failed.push(job);
                     console.error(`Error while loading ${job.name}: ${e.message}`, e);
                 }
                 var def = new Promise(function (resolve) {
@@ -254,7 +238,6 @@
     };
     odoo.log = function () {
         var missing = [];
-        var failed = [];
         var cycle = null;
 
         if (jobs.length) {
@@ -305,7 +288,6 @@
                 }
             }
             missing = odoo.__DEBUG__.getMissingJobs();
-            failed = odoo.__DEBUG__.getFailedJobs();
             var unloaded = Object.keys(debugJobs) // Object.values is not supported
                 .map(function (key) {
                     return debugJobs[key];
@@ -356,12 +338,20 @@
                 }
             }
         }
-        odoo.__DEBUG__.jsModules = {
+        const moduleInfo = {
             missing: missing,
             failed: failed.map((mod) => mod.name),
             unloaded: unloaded ? unloaded.map((mod) => mod.name) : [],
             cycle,
         };
+        odoo.__DEBUG__.jsModules = moduleInfo;
+        // The assets_tests bundle contains a lot of module whose dependencies are in other bundles
+        // that may or may not be loaded. This global is used to silence module loading errors when
+        // this bundle is present
+        if (!window.__odooIgnoreModuleErrors) {
+            displayModuleErrors(moduleInfo);
+        }
+
         didLogInfoResolve(true);
     };
     /**
@@ -440,4 +430,60 @@
         // visit each root to find cycles
         return visitJobs(jobs.map((j) => j.name));
     }
+
+    function displayModuleErrors({ failed, missing, unloaded, cycle }) {
+        const list = (heading, arr) => {
+            const frag = document.createDocumentFragment();
+            if (!arr || !arr.length) {
+                return frag;
+            }
+            frag.textContent = heading;
+            const ul = document.createElement("ul");
+            for (const el of arr) {
+                const li = document.createElement("li");
+                li.textContent = el;
+                ul.append(li);
+            }
+            frag.appendChild(ul);
+            return frag;
+        };
+        if ([failed, missing, unloaded].some((arr) => arr.length) || cycle) {
+            // Empty body
+            while (document.body.childNodes.length) {
+                document.body.childNodes[0].remove();
+            }
+            const container = document.createElement("div");
+            container.className =
+                "position-fixed w-100 h-100 d-flex align-items-center flex-column bg-white overflow-auto";
+            container.style.zIndex = "10000";
+            const alert = document.createElement("div");
+            alert.className = "alert alert-danger o_error_detail fw-bold m-auto";
+            container.appendChild(alert);
+            alert.appendChild(
+                list(
+                    "The following modules failed to load because of an error, you may find more information in the devtools console:",
+                    failed
+                )
+            );
+            alert.appendChild(
+                list(
+                    "The following modules could not be loaded because they form a dependency cycle:",
+                    cycle && [cycle]
+                )
+            );
+            alert.appendChild(
+                list(
+                    "The following modules are needed by other modules but have not been defined, they may not be present in the correct asset bundle:",
+                    missing
+                )
+            );
+            alert.appendChild(
+                list(
+                    "The following modules could not be loaded because they have unmet dependencies, this is a secondary error which is likely caused by one of the above problems:",
+                    unloaded
+                )
+            );
+            document.body.appendChild(container);
+        }
+    }
 })();
diff --git a/addons/web/views/report_templates.xml b/addons/web/views/report_templates.xml
index 5e3762bb9e0..8c70b2c95c0 100644
--- a/addons/web/views/report_templates.xml
+++ b/addons/web/views/report_templates.xml
@@ -20,6 +20,11 @@
                 <script type="text/javascript">
                     window.odoo = {};
                     window.odoo.__session_info__ = {is_report: true};
+                    // Using web.assets_common without assets_frontend or assets_backend creates a lot
+                    // of module dependency errors. Either assets_common should be reworked to work
+                    // as a standalone bundle, or this template should not use it and add what it needs
+                    // from it into its own bundle. Silence these errors in the meantime
+                    window.__odooIgnoreModuleErrors = true;
                 </script>
                 <t t-call-assets="web.assets_common" t-css="false"/>
                 <t t-call-assets="web.report_assets_common" t-css="false"/>
@@ -46,6 +51,13 @@
                 <meta charset="utf-8"/>
                 <meta name="viewport" content="initial-scale=1"/>
                 <title><t t-esc="title or 'Odoo Report'"/></title>
+                <script type="text/javascript">
+                    // Using web.assets_common without assets_frontend or assets_backend creates a lot
+                    // of module dependency errors. Either assets_common should be reworked to work
+                    // as a standalone bundle, or this template should not use it and add what it needs
+                    // from it into its own bundle. Silence these errors in the meantime
+                    window.__odooIgnoreModuleErrors = true;
+                </script>
                 <t t-call-assets="web.report_assets_common" t-js="false"/>
                 <t t-call-assets="web.assets_common" t-css="false"/>
                 <style>
diff --git a/addons/web/views/webclient_templates.xml b/addons/web/views/webclient_templates.xml
index 047879f5f6a..e4905d4bdf3 100644
--- a/addons/web/views/webclient_templates.xml
+++ b/addons/web/views/webclient_templates.xml
@@ -3,7 +3,11 @@
 
     <!-- Call this template instead of "web.assets_tests" to have the proper conditional check -->
     <template id="conditional_assets_tests" name="Tests Assets Bundle">
-        <t t-call-assets="web.assets_tests" t-if="'tests' in debug or test_mode_enabled" defer_load="True" />
+        <t t-if="'tests' in debug or test_mode_enabled">
+            <t t-call-assets="web.assets_tests" defer_load="True" />
+            <!-- The assets_tests bundle contains a lot of module whose dependencies are in other bundles that may or may not be loaded. This global is used to silence module loading errors when this bundle is present -->
+            <script>window.__odooIgnoreModuleErrors = true</script>
+        </t>
     </template>
 
     <template id="web.layout" name="Web layout">&lt;!DOCTYPE html&gt;
diff --git a/addons/website_slides/views/website_slides_templates_lesson_embed.xml b/addons/website_slides/views/website_slides_templates_lesson_embed.xml
index 4b16990e068..014751b41da 100644
--- a/addons/website_slides/views/website_slides_templates_lesson_embed.xml
+++ b/addons/website_slides/views/website_slides_templates_lesson_embed.xml
@@ -11,6 +11,11 @@
                     <title><t t-esc="slide.name"/></title>
                     <t t-call-assets="web.assets_common" t-js="false"/>
                     <t t-call-assets="website_slides.slide_embed_assets" t-js="false"/>
+                    <!-- Using web.assets_common without assets_frontend or assets_backend creates a lot
+                         of module dependency errors. Either assets_common should be reworked to work
+                         as a standalone bundle, or this template should not use it and add what it needs
+                         from it into its own bundle. Silence these errors in the meantime -->
+                    <script>window.__odooIgnoreModuleErrors = true</script>
                     <t t-call-assets="web.assets_common" t-css="false"/>
                     <t t-call-assets="website_slides.slide_embed_assets" t-css="false"/>
                 </head>