It's impossible to know what issues they have, since they don't specify.

But no, for the vast majority of people, SDL2 is perfectly fine, although SDL3 is a vast improvement. It's as stable and battle-tested as a cross platform multimedia library is bound to get. Opening a window and polling input is trivial.

Then again I've never even heard of the language they're using (Odin) so maybe that doesn't play well with a C library.

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.