I also have the same freeze every time I die while stardust is out. I had to stop using him, which is a shame.
My game was stuck in Martian Madness with no UFO spawning. 8 game days later, they finally showed up. For those of you experiencing the same problem, be patient..... VERY patient, it will happen.
So now that is done, I have headed over to the Dungeon, but no cultists. I re-killed all of the mechanical bosses, Plantera and Golem. Still no cultists. This is an old world that is not Expert mode. How do I get the cultists to spawn?
I have killed the cultists and pillars a bunch of times in my new Expert mode world, but I can not kill Moon Lord. Any tips? None of the strategies I have found online help because heart spawners, invicibility timers and campfires have all been 'fixed'. I can get his heart to about 50% before I die. My new idea is to kill him in a non Expert world where he would be easier, craft the new top tier armor, and then come back for another try in Expert. However, see above, I cant summon him in non-Expert. Is this a bug or am I missing something?