The number is not that high at all. I only see 1,289 open issues. To compare the D issue tracker has 3,677 open issues right now and the D user and developer community is tiny compared to the Go community.

Also note that "issue" does not necessary mean "bug". Such trackers are also used to request features just like in this case. Many of the D and Go "issues" are actually feature requests.

Rust has 2,163 issues at the moment, compared to Go's 1,289.

It's been a very active open source project for over five years. It's roughly 5 issues per week.