I have been playing with lovelace and picture elements card to make my floorplan. I managed to put images for off and states of the entities and everything was working fine.
All of a sudden a grey stripe with a corrupted image icon appeared in the middle of my floorplan (see image)
I checked all off my pictures, icons, and entities and they are correct.
clear your cache and refresh your page. CTRL+F5. If that doesn’t work, make sure all your image names are the same and that they open properly in a image viewing software.
Yes it was more simple than I thought. If an entity included in the floorplan becomes unavailable (in my case somebody turned off the mains switch of a hue light so the light became unavailable) then you get this corrupted image icon. Check your entities.