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Merge by distance causes edges to sharpen
Confirmed, NormalPublic

Description

System Information
Operating system: Windows
Graphics card: Titan RTX

Blender Version
Broken: 2.90.0 Alpha 2020-06-26 17.24 Hash: b7b57e7155ee
Worked: 2.83.1

Short description of error

Merge by distance causes edges to sharpen. This only occurred with this particular mesh that I REVed up from 8.31.
Blend File:

  1. Edge slide some vertices on top of each other.

  1. select all

  1. Merge by Distance

4.Causes merged edges to show up as sharpen

Event Timeline

Henrik Dick (weasel) changed the task status from Needs Triage to Needs Information from User.Sat, Jun 27, 12:18 PM

Thats interesting... can you share the file without the edge slide and merge so we can reproduce the issue?

File re-attached;

I should add that location doesn't matter, if I slide any other edge I get the same result.

Henrik Dick (weasel) changed the task status from Needs Information from User to Confirmed.Sat, Jun 27, 7:28 PM

Can confirm. Tested in 2.83 and it worked like expected. So this is probably a regression.
I also tested various alterations. It seems like face element order does change the result.

Confirmed with this .blend file on 2.90.0 Alpha, branch: master, commit date: 2020-06-25 21:53
2.83.0 works like expected.
I can not reproduce with any of my own meshes made with 2.83.0 though.