I'm not sure a public-facing curated list of specific compatibility issues would be practical at this stage of the project's life; it's changing fairly rapidly. FWIW, the bug tracker is public, and the team seems to be fairly responsive; a UPX Compression bug I ran into was tagged fixinbound within a couple weeks. https://github.com/Microsoft/BashOnWindows

The speed at which they can push new builds to people who aren't on Windows Insider is a bit unfortunate, though.