diff -r 54589bb9604d -r a407fe56d6e8 mercurial/revlog.py
--- a/mercurial/revlog.py	Mon May 03 02:33:00 2021 +0200
+++ b/mercurial/revlog.py	Fri Apr 30 03:09:16 2021 +0200
@@ -1320,7 +1320,7 @@
             return self.node(rev)
         except (ValueError, OverflowError):
             pass
-        if len(id) == 40:
+        if len(id) == 2 * self.nodeconstants.nodelen:
             try:
                 # a full hex nodeid?
                 node = bin(id)