I'm glad you've been able to see this issue fixed, but I'm wondering (genuinely) why you didn't bother reporting this issue, which kept you from upgrading software that you were paying a subscription for (!) for over three years (Ardour 6.0 was released in May 2020). As you can see from the thread, the Ardour developers were happy to improve the software based on your feedback.

In general (with a few exceptions), open source developers are happy to receive bug reports on their software. It's not like the situation in the Windows freeware world where software is just dumped on a web forum somewhere and reports go into a black hole.