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Maniphest T86603

Proportiona editing + X mirroring, has specific verts move on their own, despite not being touched
Confirmed, NormalPublic
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce RTX 3090/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.89

Blender Version
Broken: version: 2.92.0, branch: master, commit date: 2021-02-24 16:25, hash: rB02948a2cab44
Worked: (newest version of Blender that worked as expected)

Short description of error
When moving something with proportional editing on (and connected only selected) Together with X-mirror turned on. A seperate mesh's verts will be moved back. Despite not being connected

Exact steps for others to reproduce the error
Open attached blend file

proportional editing moves verts.blend2 MBDownload

make sure proportional editing is on,
make sure x-mirroring is on,
select a vert somewhere around the mouth.
notice how some verts on the teeth now move back all on their own, despite not being connected or touched.

Turning either proportional editing, or x-mirror off fixes the issue, but it shouldn't be happening even if they're on.

Event Timeline

jack conradsen (STANN.co) created this task.Mar 15 2021, 11:20 PM
Falk David (filedescriptor) changed the task status from Needs Triage to Confirmed.Mar 17 2021, 10:55 AM
Falk David (filedescriptor) added a project: Modeling.
Falk David (filedescriptor) added a subscriber: Falk David (filedescriptor).

I can reproduce this on the latest 2.93.0 Alpha, branch: master, commit date: 2021-03-17 08:18, hash: rBe91dd645a94d. This seems like an older bug. Works like expected in 2.83.12 though.