The bugs have nothing to do with the language and exist in C too.

I'll just link to some of the bugs directly that posted as issues to SDL:

https://github.com/libsdl-org/SDL/issues/4789 (not fixed) https://github.com/libsdl-org/SDL/issues/4816 (closed) https://github.com/libsdl-org/SDL/issues/4790 (closed)

And these being the bugs we found ourselves, not other bugs that have already been found, and many marked "as not planned" since SDL2 is now finished.