I’m suffering from the same thing!
When I upload images they are blank….
I’ve reset my 20-11 theme, deactivated my plugins, deleted them and reinstalled them individually while trying to upload images at each stage of doing this, and I still can’t even use my own images for the header, never mind in a page or post.
One guy suggested I check where my files are stored but there’s no settings to change on that front?!
Has anyone ever seen this problem before and had it fixed?