Using 4.17 kernel (Parrot OS) and 13.3.2.43368 of the Parallel Tools installer, on restart I get a black screen, uninstalling Parallel Tools is the only way back as far as I can tell. I followed these instructions to no avail: https://kb.parallels.com/124110
Update. Upgraded Parallels Desktop App to 14.0 still no luck after installing parallels tools and then upgrading parallels tools again. Uninstalling for now.