diff --git a/addons/web/static/src/views/fields/many2one/many2one_field.js b/addons/web/static/src/views/fields/many2one/many2one_field.js
index 61c8b6ec3b9..998256657dc 100644
--- a/addons/web/static/src/views/fields/many2one/many2one_field.js
+++ b/addons/web/static/src/views/fields/many2one/many2one_field.js
@@ -104,7 +104,7 @@ export class Many2OneField extends Component {
         };
 
         this.state = useState({
-            isFloating: !this.value,
+            isFloating: false,
         });
         this.computeActiveActions(this.props);
 
@@ -137,6 +137,7 @@ export class Many2OneField extends Component {
                 if (params.triggeredOnBlur) {
                     return this.openConfirmationDialog(name);
                 }
+                this.state.isFloating = false;
                 return this.updateRecord([false, name]);
             };
         }
@@ -146,8 +147,6 @@ export class Many2OneField extends Component {
         };
 
         onWillUpdateProps(async (nextProps) => {
-            this.state.isFloating =
-                "value" in nextProps ? !nextProps.value : !nextProps.record.data[nextProps.name];
             this.computeActiveActions(nextProps);
         });
     }
diff --git a/addons/web/static/tests/views/fields/many2one_field_tests.js b/addons/web/static/tests/views/fields/many2one_field_tests.js
index 2c09edbca4e..bf7d1cd6002 100644
--- a/addons/web/static/tests/views/fields/many2one_field_tests.js
+++ b/addons/web/static/tests/views/fields/many2one_field_tests.js
@@ -741,7 +741,7 @@ QUnit.module("Fields", (hooks) => {
             const input = target.querySelector(".o_field_widget[name=user_id] input");
             await editInput(input, null, "yy");
             await clickOpenedDropdownItem(target, "user_id", 'Create "yy"');
-
+            assert.containsOnce(target, ".o_external_button");
             assert.verifySteps(["name_create"]);
         }
     );
@@ -4487,4 +4487,32 @@ QUnit.module("Fields", (hooks) => {
             "aaa"
         );
     });
+
+    QUnit.test(
+        "external button must be displayed after the update caused by an onchange",
+        async function (assert) {
+            serverData.models.partner.onchanges = {
+                display_name: function (obj) {
+                    if (obj.display_name) {
+                        obj.trululu = 1;
+                    }
+                },
+            };
+            await makeView({
+                type: "form",
+                resModel: "partner",
+                serverData,
+                arch: `
+            <form>
+                <field name="display_name"/>
+                <field name="trululu"/>
+            </form>`,
+            });
+
+            assert.containsNone(target, ".o_external_button");
+
+            await editInput(target, "[name=display_name] input", "new value");
+            assert.containsOnce(target, ".o_external_button");
+        }
+    );
 });