I think stating a bug matter-of-fact-style is fine, personally. As long as there isn't a negative tone, I don't think you need the introduction. "Tried this, expected this, got this", with a title containing a clear summary.
I've created and maintained some libraries, and I think if a library maintainer takes issue with totally neutral, fact-stating bug reports, that's entirely on them. If you're stating nothing but the technical details, there's really no implied sense of entitlement or bitterness. Maybe it comes across as cold, but it's an issue tracker, and posting issues is the point. It fits the context.
I've created and maintained some libraries, and I think if a library maintainer takes issue with totally neutral, fact-stating bug reports, that's entirely on them. If you're stating nothing but the technical details, there's really no implied sense of entitlement or bitterness. Maybe it comes across as cold, but it's an issue tracker, and posting issues is the point. It fits the context.