Project refuses to open with pipewire

Hi there, I have a weird problem with one particular project. I can’t open this project with pipewire as backend. It opens fine with alsa, so do other projects with pipewire. My pipewire configuration has changed, I have another audio interface now. Before I had a RME Digiface (which never worked well btw.), now I got a Scarlett 2i2.
I get a segfault after the project is loaded. Editor or mixer don’t get displayed.
Is there something I can do about it?

Which version of Ardour? From the project or from your linux distribution?
As a quick task, starting ardour from a command shell will sometimes print more informative startup information.

For more thorough bug reporting there is information on how to do that:
Reporting bugs in Ardour
How to help debug Ardour

8.12 from here and 8.12 selfcompiled. Shell doesn’t tell anything related (the last thing before the segfault is a complaint about some missing key bindings in a sfz file). Surprisingly Ardour9 (obviously selfcompiled) did open the project while using pipewire.
It’s not really a big deal, I usually use ALSA anyway, but I’d like to know what’s happening here.