Reporting bugs before Ubuntu releases has never worked for me. They always land a bunch of major changes after the supposed "freeze" then they ignore all feedback because of the freeze. It's infuriating.
Glad to hear that I am not alone. I feel like launchpad is totally ignored most of the time.
To get a response on a buggy GNU coreutils patch of theirs [1], I had to mention it in a rust-coreutils bug months later...
[1] https://bugs.launchpad.net/ubuntu/+source/coreutils/+bug/215...
Reporting bugs _at all_ in Ubuntu has never worked for me.