Hi Drew,

Here is the commit that made this changed to the `A' and `Q' bindings.

The NEWS file also notes this and provides an explanation for doing so:

http://git.savannah.gnu.org/cgit/emacs.git/tree/etc/NEWS?id=bf21c84f0d3dab33b4836098b789eaddf9492b2a#n1276

*** New user interface for the 'A' and 'Q' commands.
These keys, now bound to 'dired-do-find-regexp' and
'dired-do-find-regexp-and-replace', work similarly to 'xref-find-apropos'
and 'xref-query-replace-in-results': they present the matches
in the '*xref*' buffer and let you move through the matches.  No need
to use 'tags-loop-continue' to resume the search or replace loop.  The
previous commands, 'dired-do-search' and
'dired-do-query-replace-regexp', are still available, but not bound to
keys; rebind 'A' and 'Q' to invoke them if you want the old behavior
back.  We intend to obsolete the old commands in a future release.

-- 
Kaushal Modi