Automatically delete messages from Trash after 30 days not working

[kotecky]

The setting "Automatically delete messages from Trash after 30 days" is not working on my account.

The setting is on:

The messages remain:

There are gaps in the timeline so it could be that the routine worked somehow in the past but not fully:

• Browser: FF on all devices (+-4), Thunderbird on some (2), K9 on one device.
• Version: always the latest versions.
• Devices: Samsung Galaxy S23 on Android, various PCs with Win10 and Win11.