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Dragging a task from a milestone column to a main board column occasionally fails with "Duplicate entry..." error
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See PHI119. See PHI1128.

In unknown circumstances, dragging a task card from a "Milestone" column to a normal board column may fail with an error like:

Duplicate entry '<projectPHID>-<columnPHID>-<objectPHID>' for key 'boardPHID'

I made a significant effort to reproduce this in T13074, but wasn't successful. It's possible adjacent changes have fixed it.

This is likely easy to fix if we can find a reproduction case, but we don't currently have one.