BUG: VG Indexes do not cover every edge case

[KirilStrezikozin]

This bug report is:

• not a duplicate
• fixed

Describe the bug
@spawd reported on Discord: Is 0 a valid VG index? Asking because I have an object with VG 4 and it's getting affected by a VG 0 object. different VG objects are also affecting each other, VG 8 is getting affected by VG 4
If I hide the other objects and rebake AO, it's baking as expected