Lockscreen gets stuck after hibernation

I am observing the issue that my lockscreen gets stuck after hibernation. Both on X11 and Wayland session. I can not switch to tty, so I have to use the off switch coldly. On X11 at least, the session is killed (I guess) and I’m back at sddm to log in.

I’m using a slideshow of tons of pictures, in subfolders, too. Will report back here as well, as I have not loo(c)ked into it more deeply for now.