Thanks for the interest ! I appreciate it !
There is the game :
https://casual42.itch.io/you-shall-not-pass
I use relative paths for all my files.
In fact, the images that fail to load are always the same 4. Moreover, they are part of a series of 10 images that are very similar in all aspects, and the others load fine.
The images are sorted in an object called 'allImages'. The keys of the images that fail to load are :
item_emblemWisdom
yellow 1
yellow 2
yellow 3
The console also indicates that https://cdn.siftscience.com/s.js failed to load. I'm pretty sure it's an element added by itch.io, but don't think it's a big deal.
Today I've been looking for a way to get more information from an error Event. If you know how, I can add it to the code, but for now, I don't think I can get more information from the console.