The issue:
From what I understand it’s this changeset
And looking at a node allows to confirm that it’s still the current state: Node: 11740884037 | OpenStreetMap
From what I understand it’s this changeset
Reverted in https://www.openstreetmap.org/changeset/182763910 and https://www.openstreetmap.org/changeset/182764012 . I also reverted the 5 following changesets to avoid revert problems, so those will need to be reapplied.
Ban JOSM! 
Edit: The original “Ban Potlatch” question was on the old help site (added as seed data when that first started). Do watch the video…
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Thanks for the revert :D
Ban JOSM => make it more aggressive about node drag, not just a warning after the drag action that can be silenced forever :P
(same popup warning on upload attempt?)
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In fact JOSM sometimes doesn’t warn at all. I’ve fixed one reason recently with r19556, see #24687 ([Patch] JOSM doesn't warn about many moved nodes when rotating or scaling several objects) – JOSM
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Multiple levels of warning might be handy. I occasionally get warned for moving a single building or cluster of buildings to match the same imagery offset as the rest of the local map data. It would be nice to be able to turn that off while still getting warned if I make a change where the majority of the affected nodes are offscreen (or maybe where the bounding box of the move is several times bigger than the viewport size).
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