Sleep not working when having (certain?) apps open

Hi all, for a few month now I can only get my computer to sleep (on two different machines) when most apps are closed. If these apps are open (most often Dolphin, Firefox and Thunderbird but it sometimes works with some of them open), the screen just turns black for a few seconds and then turns on again with the lockscreen (I can then unlock, close a few more apps and try again).

What can I try to pinpoint the problem here (which logs to look at and how?)

Some info:
KDE Plasma 6.4.3
Kernel 6.15.6-105.bazzite.fc42.x86_64 (64-bit)
AMD Ryzen 7 7700
NVIDIA GeForce RTX 4070
ostree-image-signed:docker://ghcr.io/ublue-os/bazzite-nvidia-open:stable
42.20250720 (2025-07-20T07:52:37Z (Oh, I see there is a new version, I'll update and see if this has gone away).

Thanks for all the cool work you do! ^__^
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