There is a bug in GLib that is affecting Ubuntu 20.04 containers. https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2435 This bug was fixed in at least GLib 2.71.3.
Pull request: https://github.com/webkit/webkit/pull/14231
Committed 264505@main (b18feb6f416c): <https://commits.webkit.org/264505@main> Reviewed commits have been landed. Closing PR #14231 and removing active labels.
<rdar://problem/109818895>