I think every kitchen sink standard library has some rough edges. Java is also a kitchen sink language and it, too, has rough edges around certain areas. I don't know Go well enough to have an opinion on where its weaknesses are.

As for this question, > I'm on the fence about whether I should learn Go or Rust while I am on a short employment break.

What are you learning the new language for? If for fun, then this question is longer. If for employment, I would bet that there are more devops, devops adjacent and "systems developer" roles in the Go language.