Thanks for the data!
It looks like this is a general issue somewhere between GTK+ 3 and that appmenu-gtk-module and has nothing to do with either Debian or blueman specifically.
I could easily reproduce it in a Manjaro VM by running Wayland and
starting either of the following applications with the module enabled:
* blueman
* gimp
* transmission-gtk (version 3, as 4 uses GTK 4)
The traces show an insane stack of gtk_css_node_ensure_style frames.
There are probably many more GTK+ 3 applications out there, that can
trigger the issue, but, supposedly, it depends on some specific structure.
References:
https://gitlab.gnome.org/GNOME/gimp/-/issues/11564 for GIMP
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1036775 for transmission
While the cause is most probably somewhere in that appmenu-gtk-module, I
can image that
https://gitlab.gnome.org/GNOME/gtk/-/commit/fc823eb61002d1350305cba6ec718a7c4f6c05e1
covered it, so that GTK 4 is not affected by the crashes.
Workarounds include excluding appmenu-gtk-module from GTK_MODULES or
setting GDK_BACKEND=x11.
Regards
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