there seems to be some issue with --allow-other in the latest beta. I have had to roll back to 1.52.2 and can now successfully see mounts that are being created using systemd. The exact same config breaks with the latest beta, the mounts are only visible by my root user.
I will have time tomorrow to paste logs and confg, but for now this should be easy to test to verify.
edit: I have applied beta 18.104.22.168 and --allow-other is still working in this release. I will see which beta this breaks and update this post accordingly.