Loading My Pet Dungeon save destroys Dungeon Core

I have been trying to play a new Hell's Deep My Pet Dungeon after the Undergames update, and usually when I load the save, my Dungeon Core suddenly self-destructs as soon as the game loads and I am ejected from the game. This doesn't always happen, but it has multiple times, and I have noted that it may have something to do with being over the Dungeon Core when you save.

I have also noticed that after defeating Mira, if I load a save, her claimed tiles will be rendered into Earth tiles instead.

Here are the saved games.

https://www.dropbox.com/sh/c0xj3dmfp2iob4c/AABc9dKnqDuiaG2G6VOm8tvAa?dl=0