Weapons which cause excessive acid damage, such as Doombeams (beam + beam) of sufficient size will freeze local server instances and will likely freeze multiplayer instances. The server does not recover from the crash at any point, requiring a forced restart.
Ships used in this testing:
Target: https://drive.google.com/open?id=1ZsA7VgXm7c9TAUBCJaGxxBTUe8Fve14_
Firing ship: https://drive.google.com/open?id=1wIK4gN2mMYH9xfNg8Sk3CTylIyOZPl-U