When importing a certain package that has a similar named script - in this case - "ScrollRectOcclusion" vs "UI_ScrollRectOcclusion" the asset importer tries to override that script. the user will only get the option to override that script or not import it at all, which will cause issues both ways.

Also, due to the fact that there is a GUI conflict, which causes the original file to be overridden, references in the package to that script are overridden.

To repro:
- download this project
- download the attached "import_me.unitypackage"
- notice that it't trying to override that script
- notice that the prefab will now reference the UI_ScrollRectOcclusion.cs, instead of the original - ScrollRectOcclusion.cs

reproducible in 2018.4.23f1, 2019.3.13f1, 2020.1.0b10 and 2020.2.0a11