BUG: Fix pandas-dev#61221: Exception with unstack(sort=False) and NA in index.

Author: Gabe Small

doc/source/whatsnew/v3.0.0.rst

@@ -798,6 +798,7 @@ Reshaping
 - Bug in :meth:`DataFrame.pivot_table` incorrectly subaggregating results when called without an ``index`` argument (:issue:`58722`)
 - Bug in :meth:`DataFrame.stack` with the new implementation where ``ValueError`` is raised when ``level=[]`` (:issue:`60740`)
 - Bug in :meth:`DataFrame.unstack` producing incorrect results when manipulating empty :class:`DataFrame` with an :class:`ExtentionDtype` (:issue:`59123`)
+- Bug in :meth:`DataFrame.unstack` where when sort is False, in frames with NA columns, unstacking causing errors or improper orders (:issue:`61221`)
 - Bug in :meth:`concat` where concatenating DataFrame and Series with ``ignore_index = True`` drops the series name (:issue:`60723`, :issue:`56257`)
 
 Sparse