Imported asset with Plugin folder now most types has lost its reference and does not auto complete

I recently imported the asset Easy save but this issue probably affects all assets with a plugin folder.

After importing Easy Save most types in my scripts are now black(specifically Unity’s default types) and shows no reference when hovering over the names and does not auto complete when typed.

This seems to be linked to the plugin folder as its only after I remove that folder it goes back to normal again.

What do I need to do to be able to import assets with a plugin foldr without breaking anything else?

126742-unity-example.png

This is an example.