i dont know if youve mentioned this before in one of your posts..but i think the reason why centipeetle broke down in monster buddies is because she saw a flash of light (the light reflected off garnets gauntlets if im not wrong) which might relate to the final attack the diamonds unleashed upon the earth during the gem war. idk just something i noticed.
If I recall, Steven mentioned that Centipeetle was reacting to the Gems’ drawing their weapons! He asked them to put those away and when they did, Centi was more calm, and even calmer after they left.
So I’d say it was that same sentiment later in the ice caves, because when Garnet took out her gauntlets, Steven quickly tells her not to :D