Go get / mod tidy - must all modules now have a 'latest' and/or 'vx.y.z' tag?

[Russtopia]

Hi all, I was recently migrating my setup from Apache2 to Caddy on a home server and hit a strange issue with hosting vanity URLs for my modules.

I was seeing mysterious failures in 'go get' for some modules, but not others; turned out it seems now one has to have a tag on a module for `go get` to find it properly (otherwise I was getting a 502 error); whereas in the past I thought `go mod tidy` would just grab and auto-label the latest commit when generating go.mod.

Was there a change in recent versions of go or was I just hallucinating?

-R.