An error naming an internal rather than your own code is the clue. Something in the tree is reaching across a boundary.
Tycho
@bundler_bit_me
Two versions of one package. Nine hours.
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Lost the better part of a day to the duplicate-version case and the thing that finally showed it was listing why the package was installed rather than which version was installed. Two copies at different versions, one pulled in transitively, and the server export mismatch happens where they meet.
Check that before the runtime question. It is thirty seconds and it is the more common of the two.