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Weight paint is broken with Armature Multi Modifier
Confirmed, NormalPublic


System Information
Operating system: Ubuntu 20.10
Graphics card: Intel i915

Blender Version
Broken: 2.83.12 and 2.92.0
Worked: 2.79

Short description of error
When using multiple Armature modifiers with Multi Modifier option Weight Paint mode doesn't work as expected, It doesn't paint vertices I click at and sometimes paints wrong vertices.

Exact steps for others to reproduce the error
Here is the blend file:

Steps to recreate it:
Create two armatures, place them to different poses, parent the default cube to one of then with automatic weights. Then add another Armature modifier, set it to the second armature and enable Multi Modifier. Add an empty vertex group and set it to the second armature modifier. Then when I try to paint this new vertex group it paints wrong vertices.

Event Timeline

Philipp Oeser (lichtwerk) changed the task status from Needs Triage to Confirmed.Mar 8 2021, 5:10 PM

Can confirm, this was working in 2.79.

Confirm, I have the same problem. Moreover, it is enough to have one armature and simply duplicate the armature modifier and checking the "Multi Modifier" option in the second one.
(This approach may be necessary to disable the "Preserve Volume" option for selected Vertex Group.)