Failed to import custom package (package.json has no .meta file)

Something has changed in the creation of unity custom packages? I'm not able to import this simple package (https://github.com/SwingWren/test-package) I get the error "Asset Packages/com.coolthing.hello-world/package.json has no meta file, but it's in an immutable folder. The asset will be ignored."

I'm able to import packages that I've already created but not this one. Tried to delete package cache and library folder but doesn't seem to work.

 

It seems that the problem was having *(Auto Backup)* in the .gitignore. Very hard to find the issue