The fix is now available in groovy-proposed, and will go to updates once it has passed QA:
The fix has been merged upstream to the gnome-3-38 branch. So it will hopefully make its way to other distros as they update.
Looking forward, snapd is also being patched to give snaps plugging the x11 interface access to the non-abstract sockets:
https://github.com/snapcore/snapd/pull/9530
The GNOME devs have indicated that they would like to remove the abstract socket again in a future release, as it is not possible to selectively make abstract sockets available to sandboxed applications without a kernel level MAC system like AppArmor or SELinux. So this should protect us for when that time comes.