diff --git a/addons/hr_holidays/models/hr_leave.py b/addons/hr_holidays/models/hr_leave.py
index c148a278e49..6076404c5fa 100644
--- a/addons/hr_holidays/models/hr_leave.py
+++ b/addons/hr_holidays/models/hr_leave.py
@@ -547,7 +547,7 @@ class HolidaysRequest(models.Model):
                       ('company_id', 'in', self.env.companies.ids + self.env.context.get('allowed_company_ids', [])),
                       # When searching for resource leave intervals, we exclude the one that
                       # is related to the leave we're currently trying to compute for.
-                      ('holiday_id', '!=', self.id)]
+                      '|', ('holiday_id', '=', False), ('holiday_id', '!=', self.id)]
             if self.leave_type_request_unit == 'day' and check_leave_type:
                 # list of tuples (day, hours)
                 work_time_per_day_list = self.employee_id.list_work_time_per_day(self.date_from, self.date_to, calendar=resource_calendar, domain=domain)
diff --git a/addons/hr_holidays/tests/test_global_leaves.py b/addons/hr_holidays/tests/test_global_leaves.py
index fe7ff421711..a81c7ff715d 100644
--- a/addons/hr_holidays/tests/test_global_leaves.py
+++ b/addons/hr_holidays/tests/test_global_leaves.py
@@ -1,7 +1,7 @@
 # -*- coding: utf-8 -*-
 # Part of Odoo. See LICENSE file for full copyright and licensing details.
 
-from datetime import date, datetime
+from datetime import date, datetime, timedelta
 from odoo.addons.hr_holidays.tests.common import TestHrHolidaysCommon
 from odoo.exceptions import ValidationError
 from freezegun import freeze_time
@@ -130,3 +130,48 @@ class TestGlobalLeaves(TestHrHolidaysCommon):
         # Note:
         # The user in Europe/Brussels timezone see 4:30 and not 2:30 because he is in UTC +02:00.
         # The user in Asia/Calcutta timezone (determined via the browser) see 8:00 because he is in UTC +05:30
+
+    def test_global_leave_number_of_days_with_new(self):
+        """
+            Check that leaves stored in memory (and not in the database)
+            take into account global leaves.
+        """
+        global_leave = self.env['resource.calendar.leaves'].create({
+            'name': 'Global Time Off',
+            'date_from': datetime(2024, 1, 3, 6, 0, 0),
+            'date_to': datetime(2024, 1, 3, 19, 0, 0),
+            'calendar_id': self.calendar_1.id,
+        })
+        leave_type = self.env['hr.leave.type'].create({
+            'name': 'Paid Time Off',
+            'time_type': 'leave',
+            'requires_allocation': 'no',
+        })
+        self.employee_emp.resource_calendar_id = self.calendar_1.id
+
+        leave = self.env['hr.leave'].create({
+            'name': 'Test new leave',
+            'employee_id': self.employee_emp.id,
+            'holiday_status_id': leave_type.id,
+            'request_date_from': global_leave.date_from,
+            'request_date_to': global_leave.date_to,
+        })
+        self.assertEqual(leave.number_of_days, 0, 'It is a global leave')
+
+        leave = self.env['hr.leave'].new({
+            'name': 'Test new leave',
+            'employee_id': self.employee_emp.id,
+            'holiday_status_id': leave_type.id,
+            'request_date_from': global_leave.date_from,
+            'request_date_to': global_leave.date_to,
+        })
+        self.assertEqual(leave.number_of_days, 0, 'It is a global leave')
+
+        leave = self.env['hr.leave'].new({
+            'name': 'Test new leave',
+            'employee_id': self.employee_emp.id,
+            'holiday_status_id': leave_type.id,
+            'request_date_from': global_leave.date_from - timedelta(days=1),
+            'request_date_to': global_leave.date_to + timedelta(days=1),
+        })
+        self.assertEqual(leave.number_of_days, 2, 'There is a global leave')