pfSense

Edit a PPPoE interface.
Advanced
1) Choose Periodic Reset = Custom
Enter an hour and minute in Reset Date/Time
Save
The hour and minute do not end up anywhere in the config, when you edit again they are gone.

2) Choose Periodic Reset = Pre-set
Select a reset frequency (e.g. hourly)
Save
The reset frequency does not end up anywhere in the config, when you edit again it is gone.

I haven't looked at this on 2.2.* - I just noticed it on 2.3 when doing some work on the Advanced button.
These are issues both before and after I touched the Advanced button code.