MC Version: 1.12.2

Forge Version: 14.23.5.2847

ChanceCubes Version: 1.12.2=2.4.74-universal

The Issue: I'm playing Project Ozone 3: Normal mode. I was in the hunting dimension and broke a chancecube which spawned the glass dome of water and the mimic boss. I killed it, and when I checked the loot after, the Jetpack I was wearing was duplicated in my inventory. Video from stream: https://www.twitch.tv/videos/626838555. Fight starts at 1:40:48.

Origin: modpack on twitch launcher

Logs: