Per-folder retention policy is not saved when set

[GuiltyDoggy]

In my account settings I have set the global setting to "Don't delete any messages".

I am trying to set the retention policy for specific folders (e.g. Junk) to delete messages more than 30 days old by selecting the Properties of the folder and going to the Retention Policy tab. I deselect the "Use my account settings" checkbox and select the "delete messages more than 30 days" radio button. I then close the Properties window.

I notice that the change I made in the Retention Policy does not save. When I open the Properties window again for that same folder I see that the setting is reverted to "Use my account settings".

OS: Fedora 40 Kinoite
Thunderbird 115.10.1 Flatpak