diff -r b508cffd3c04 -r 0043c7aa3250 mercurial/dirstate.py
--- a/mercurial/dirstate.py	Wed Jun 08 11:55:40 2022 +0200
+++ b/mercurial/dirstate.py	Wed Jun 08 15:39:14 2022 +0200
@@ -1247,6 +1247,7 @@
             matchmod.alwaysmatcher,
             matchmod.exactmatcher,
             matchmod.includematcher,
+            matchmod.unionmatcher,
         )
 
         if rustmod is None: