> I suspect you are dual-booting, which is itself a hacky middle ground full of bugs. Linux and windows will never share a drive well.

The Windows installer unfortunately will happily clobber the EFI partitions on completely unrelated drives. Had it happen on a triple boot (Win/Linux/Hackintosh) setup a couple of times, with each OS getting its own drive. MS almost certainly is not testing against multi-OS setups of any kind.