Description of Craft: A basic ship with a 5 block, tier 0 reactor.
Note: Chamber Tier shall be used to refer to the order in which chambers are connected. A Chamber Tier of 1 is a chamber that is connected directly by conduit to the reactor. A Chamber Tier of 2 is a chamber that is connected by conduit to another matching chamber.
Description of Bug: When adding a chamber block to a chamber setup in which the added chamber block would make one chamber tree a Chamber Tier 2, if the added chamber block touches a chamber block of the same type that is part of a Chamber Tier 1 chamber tree, then the game crashes. If the game does not crash immediately, attempting to remove one of the chamber blocks will crash the game. I have tested this with both Stealth Chambers and with Defence Chambers.