Comment 2 for bug 1613845

Explanation as to what caused this to break from zyga via IRC:

/var/lib is not bind mounted so you get what you'd get in an all-snap system (read only content of the core snap). Services should use /run or for sockets AFAIR (sadly we cannot support arbitrary locations)... the change is the use of chroot, in the past we bind mounted a few directories from the core snap to the root fs. Now we chroot to the core snap and bind mount some things from there