LXD 3.22 - Cannot open /proc/stat: Transport endpoint is not connected

Running snap LXD on Ubuntu 18.04 (4.15.0-76-generic), it looks like that after an upgrade to 3.22 containers broke similar to this issue https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=920985

Simply restarting the containers seems to fix the issue.

Am not sure how to get lxcfs.service logs from snap LXD so I can’t post any relevant logs.

EDIT: I was wrong, simply restarting the container only gets things half-working.

# df -h
df: /var/lib/lxcfs: Transport endpoint is not connected
<rest of normal df output>