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Bevel edge with segment = 1 produces undesired UV result on UV boundry edge
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Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 442.59

Blender Version
Broken: version: 2.90.0 Alpha, branch: master, commit date: 2020-07-05 20:45, hash: rBbaf124c753d9
Worked: version 2.83.1

Short description of error
Bevel on edge that belongs to uv border does not give correct behaviour in uv editor. This worked in blender 2.83.1

Exact steps for others to reproduce the error

  1. Create default cube and enter edit mode
  2. Select edge with index 2 on default cube
  3. Bevel with amount of segments not dividable by 2 (e.g 1, 3, 5, 7 etc)

Detailed error description

  • Edge belongs to uv boundry
  • Bevel operator has amount of segment that are not dividable by 2 (e.g. 1, 3, 5, 7 etc)
  • Is not edge with index 0, 4 or 10 on default cube??!?!?!!?!
Starting point
Bevel segments = 2 has desired uv behavior
Bevel segment = 1 has undesired uv behavior
Starting point
Bevel segments = 2 has desired uv behaviour
Bevel segment = 1 has desired uv behaviour, but I can not figure out why since other border edges does not work. The edges marked with green with index 0, 4 & 10 has desired uv behaviour for unknown reason

[Based on the default startup or an attached .blend file (as simple as possible)]