I'm using H20.0.506 and Win 10 and the new digital asset save window seems to have some issues when saving to a network drive.
I'm trying to save it to a path that starts with \\fs\ but when I hit save the hda gets save in C:/fs/ instead.

This exact same approach and network drive worked fine with the old interface so I'm wondering if anyone else have had this issue and perhaps found a work around preferably without having to mount the drive.

Is this just a user error from my side or perhaps a genuine bug that I should report?

Sounds like a similar issue reported in this thread https://www.sidefx.com/forum/topic/93227/ [www.sidefx.com] that was already fixed in recent versions