Calamity bosses wont spawn

[Aqua247]

I just started a 1.4 modded mage playthrough the other day. I'm at the point where I'm ready to fight Desert Scourge. For some reason, the boss isn't spawning when I use the boss spawn item. I'm in the desert while trying to spawn it, and it still isn't happening. Is this happening to anyone else?

edit: I figured it out. If anyone else had the issue, just disable Boss Checklist.

[Aqua247]

Not just calamity bosses. EOC isn't working either.

[Cynicade]

Turn off boss checklist.

It has a habit of bugging and breaking spawns/respawns.

[Aqua247]

Someone on Discord already told me, but thanks anyway. :)

[Brubuulin]

I'm playing with another player, we have the same problem. The host removed the boss checklist, but the summons are still not working. Tried it on a solo world and it worked, but not in multiplayer.