Some thumbnails appear and disappear

Submitted by Alexander Kurakin

Assigned to Ali Abdallah @ali

Link to original bug (#16349)

Description

I have directory with *.jpg and *.webp files. Every *.jpg has a thumbnail. No one of *.webp files has a thumbnail... or... has? It appears when I rename a file... Or go directory up and then inside, back.. Other disappear on renaming... BBrrrrr... I don't understand anything.