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Box with beveled vert will damage, if use multires modifier in simple mode.
Confirmed, NormalPublicBUG

Description

System Information
Operating system: Fedora 32, 64bit
Graphics card: GTX 650Ti

Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-03 15:46, hash: rBd2c52d4de2ca
Worked: blender-2.82a-windows64

Exact steps for others to reproduce the error
Add cube, bevel one vert (1 segments) add multires modifier, select simple mode, and subdivide 2 or 3 times. Mesh will damaged.
If beleled 2 or more verts subdivision works stability, but not always. Sometimes it will damaged, sometimes properly.

Event Timeline

Igor (ekkl) renamed this task from Blender 2.83 to Box with beveled vert will damage, if use multires modifier in simple mode..Tue, Sep 1, 4:27 PM
Igor (ekkl) edited projects, added BF Blender (2.83); removed BF Blender.

If you apply a bevel to all the vertices of a cube, then use a multires modifier and apply it with a subdivision of 3-4, you get the wrong mesh

Richard Antalik (ISS) changed the task status from Needs Triage to Confirmed.Thu, Sep 3, 10:57 PM
Campbell Barton (campbellbarton) changed the subtype of this task from "Report" to "Bug".Tue, Sep 22, 10:16 AM