Bugs are now managed in sdl2-compat's GitHub Issues tracker:
https://github.com/libsdl-org/sdl2-compat/issues
You may report bugs there, and search to see if a given issue has already been reported, discussed, and maybe even fixed.
You may also find help at the SDL forums:
Bug reports are welcome here, but we really appreciate if you use the bug tracker, as bugs discussed on the forums may be forgotten or missed.