(The above code was actually used by the author of the above commit to
argue that a more permissive regexp was needed, but in his test run the
file owner and group fields were the same for each entry and there was
no misalignment.)

The misalignment here can be repaired by evaluating
`(dired--align-all-files)' in the find-dired output buffer.  But it also
works to add this sexp to find-dired-sentinel.  Doing that thus obviates
using the current permissive regexp in find-dired-filter to avoid the
misalignment reported in Bug#29803, and also avoids (or rather: repairs)
the misalignment just illustrated, but in addition also avoids the
replace-match error of the current bug report.  In short I propose the
following patch: