What are the steps to reproduce your issue?
Launch a new website.
Edit / Update header, background image, and other text / Save
What is the current behavior that you observe?
When hitting save, a window appears:
Confirmation
If you discard the current edits, all unsaved changes will be lost. You can cancel to return to edit mode.
Hit cancel and exception appears:
Odoo Client Error
CloseCopy error to clipboard
An error occurred
Please use the copy button to report the error to your support service.
See detailsUncaughtPromiseError
Uncaught Promise
UncaughtClientError > TypeError
Uncaught Javascript Error > Cannot read properties of null (reading 'isCollapsed')
What would be your expected behavior in this case?
Page should save without error.