A couple of my more advanced AS single player worlds (1.7.2 and also in 1.8.2) have an issue when I click play that it then acts like it tried to connect to a multiplayer game then kicks out to the multiplayer menu with an error of "Connection Lost A fatal error has occured, this connection is terminated" with a "Back to server list" button. It happens now about 5 out of every 6 attempts before I can get into my single play world (no servers - just my PC).
Once I do gain access a lot of my lens beams are invisible though they still give any effects as if they are still there.

Per Doomgull on Discord:
"Might be related to #144 on the tracker, maybe not.
Can you toss up a copy of the network data for the world (${worldfolder}/AstralSorceryData/DIM_${DimensionId}/lightnetwork.dat) and the logs into a new issue? Hellfire might get useful data then.
easier to merge them if they're the same than split them apart again if they're unrelated
because networkcode"

I included the "logs" folder and the entire "AstralSorceryData" folder in a zip file below.

Astral Sorcery issue.zip