Why when I use MyBlocks+ extension, when I import a sprite into the project does it break all the my blocks?

[LibraryOfStuff]

So, I basically made almost a custom extension like thing using my blocks+ blocks with the for all sprites thing enabled, but when I try to import sprites into the project that is hosting this toolkit or if I import the toolkit sprite into a project, all of the my blocks get totally broken and everything breaks permanently? (Using the backpack.)

https://files.catbox.moe/v7hnfm.mp4

(Using catbox because it's a free permanent file uploader and github failed to upload >:P)

[LibraryOfStuff]

Please answer, this would solve some stuff if there is a work around.