Minecraft Version: 1.16.5
Mod Version: dimensionalpocketsii-1.16.5-1.4.13-universal
Cosmos-Library Version: cosmoslibrary-1.16.5-6.8.0-universal
Full crash report: https://pastebin.com/z9ia1fXS
Whether you where running it on a server, or a client: Client

Description:
Armor Stands being created will randomly crash the game.
Replicated by doing "/summon minecraft:armor_stand x y z" a few tens of times
Also occurs with Armor Stands generated in structures.

Hi, this is most likely due to changes with Forge and updating to a new version of Forge. I will take a look into this issue.