You need to understand that the person you are reaching out to has probably spent 100s of hours working on this project, for free. They do not owe you anything. The maintainers are extending a courtesy by giving away their work for free and then making themselves available to support it. The point is, you should try and be nice when filing for support. The maintainer of the project has literally no obligation to help you.

Actually, I've decided to stop using labels for a while. A "bug" label gives the impression that someone else is going to fix the problem. We don't have enough volunteers for that (new contributors welcome!). I try to help people working on issues, though. I've spent many hours on this one.

All activities are best-effort (keep in mind that most of us are volunteer developers).

The date, time and place are scheduled according to when/where we can reserve Matz's time.