Tests fail with GLib 2.76.0

Trying to upgrade GLib to 2.76.0 on NixOS, the tests started to fail with:

(fprintd:9047): GLib-GIO-CRITICAL **: 16:35:54.205: GTask 0x460f20 (source object: 0x45fe70, source tag: (nil)) finalized without ever returning (using g_task_return_*()). This potentially indicates a bug in the program.

Full testlog.txt

I have bisected it to https://gitlab.gnome.org/GNOME/glib/-/commit/fe89940572e2c01e5bb04504ba4de09bea1122a2