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Vertex groups are lost if I save a file in 3.0 and open in 2.92 without warnings
Closed, ResolvedPublic

Description

Blender Version
Broken: 3b6ee8cee708
Worked: 3b6ee8cee708~

Short description of error
Blender 3.0 made disruptive changes without bumping the minimum version requirement.

Exact steps for others to reproduce the error

  • Create a file with Blender 2.93, add vertex groups.
  • Go in master and open that file and save it.
  • Go back to 2.93 and open that file. There is NO warnings yet the vertex groups are gone.

Sample file already saved with 3.0: