Was happening when there are deform modifiers prior to the multires.
There are detail in the comment around sculpt_undo_refine_subdiv(),
but briefly: the subdiv was refined with wrong base mesh coordinates.
Differential D10158
Fix T76936: Mesh shape amended upon undoing in sculpt mode Authored by Sergey Sharybin (sergey) on Jan 20 2021, 12:16 PM. Tags None Subscribers None
Details Was happening when there are deform modifiers prior to the multires. There are detail in the comment around sculpt_undo_refine_subdiv(),
Diff Detail
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