Been testing this and its a SEVERE bug you need to handle.
To reproduce
1 - Create a material. Put a ANY BAKED BOM TEXTURE (i.e. UPPER) on the BASE color slot.
2 - Create a box. Apply material to it.
3 - Pick up the box. Give it to other avatars.
4 - Avatars wear it.
Result
The attachment on AGENT A shows baked texture on AGENT B and vice versa. Keeps changing when zooming in and out, or if any of the agents rebakes his maps or reattaches anything.
Found this happening on my avatars after updating them to BoM. But after a simple test the bug is super easy to reproduce.