Bug Deleting from Project Explorer broken in 5.5

In all betas before 5.5, I could delete things in the Content Explorer panel.

Since 5.5 (currently testing with 5.5b5), when I delete something in the Content Explorer panel:

1. It disappears for half a second
2. Then the supposedly deleted asset gets reimported instantly

I can rename and create assets and these changes are reflected in the file system, but deletion just fails since Unity 5.5.

Gentoo AMD64, KDE5, project folder is on an NTFS partition mounted with ntfs-3g/fuse. The NTFS stuff shouldn't matter (and hasn't affected Unity before), to the contrary, it gets rid of case sensitivity issues for me