The tentative fix for auto-connect issue has a PR https://github.com/snapcore/snapd/pull/4981 and should be available tomorrow, we need to test it from edge first.
The other issue mentioned above (with lxd plugs missing) is a different problem and slightly more complicated, it’s being discussed still on IRC.
UPDATE: see Summary of core + lxd refresh bugs discovered on 4th of April 2018