Maintenance periods are not working after upgrade to 5.4

[StyleTec]

Hi y'all,

i recently noticed, that all our maintenance periods are not working anymore after the upgrade to 5.4.
We only have really simple periods (see screenshot attached).

Before the upgrade (we had 5.2 before) the notification suppression just worked, but now it is not.

Anyone got an idea?

Thanks

[dominicpratt]

Having the exact same problem...