TapGhoul
Avatar SDK version: 3.10.6
Reproduction steps:
  1. Make 2 objects
  2. Add contact receivers to both
  3. Add a tag to each - doesn't matter what, they just have to be different
  4. Multi-select both, and tick "Write to Materials"
The Collision Tags of the last one to activate will be written to all contacts, silently breaking them. The operation is also not properly recorded, so undoing it will not revert the contact tags properly.