Joseph Buchignani wrote:
>I suspect it can't find where to replace the priority because of
>something in the star hiding mechanism of indent mode.

Fix in master.

The problem was that if org-ident-mode was enabled, the function that
read the new priority cookie destroyed the match data of the regular
expression that check whether there is already a priority cookie or
not.  So Org couldn't replace the old cookie (=what had matched a
regular expression) properly.

Thanks for reporting,
  -- David
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