Has anyone seen Duplicate Positions in Redwood?

Summary: We rolled out Redwood for Workforce Structures under 24D. We found a position or two that were "corrupted" where you couldn't open them but somehow they had been used actively in transactions for a while so we ignored them. The Position Diagnostic reports didn't list them as being corrupt.
With Redwood came other issues with more failures being seen with our HSDL loads. Apparently pre-Redwood a

Position could have 2 Grades but post-Redwood they could not. When testing 25A in DEV pods we started seeing that existing HSDL loaders used to change the Grades on existing positions were only changing the Valid Grades and not the Entry Grades, even though we don't have Steps or Grade Ladders. Only one Grade used to show before Redwood.