Hi !
I think I’m having a similar problem, image files don’t show in editing (with ozan’s plugin) or view mode.
View mode (png don’t show):
Edit mode :

It seems to be image files specific as pdf preview from the same directory works fine.
It’s also specific to this vault, “Obsidian help” display images fine.
My operating system is Pop_Os! on Gnome.
Any pointers on ways to trouble shot / resolve this issue ?
Regards