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mirror + bevel modifier problem
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System Information
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1070/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 416.94

Blender Version
Broken: version: 2.80 (sub 64), branch: blender2.7, commit date: 2019-05-14 00:25, hash: rBa5b5bd2c24e0

Short description of error

As you can see in the picture I get this weird spike only on one side of the mesh.
thank you

Event Timeline

Only X,Y mirror have the problem.

Bevel weights are the same.
By moving vertices vertically the spike change size.

Philipp Oeser (lichtwerk) triaged this task as Confirmed, Medium priority.May 14 2019, 12:32 PM

Can confirm.

Not sure this has anything to do with mirroring?
In the following file, you can turn a "good" situation into a "bad" situation by just moving the selected vert slightly (or just run the script there...)

@Howard Trickey (howardt) : mind checking?

Thanks Philipp for doing such a nice job of isolating the problem. I confirm this problem and am working on it,