Old problem: missing graphics

I used to talk about this problem, and just noticed it is still there.
Some pictures are missing.
Here I was looking at genres, which I never do; gray boxes.
This is on a brand new iPad Pro 12”, nothing bad in the local cache.
Funny enough, I switched to Safari to start writing this, switched back and it’s different: some of the previously missing pictures are ok, but some other ones are now red.