diff -r fc1ba19ec4a0 -r c6d44457f7e3 mercurial/extensions.py
--- a/mercurial/extensions.py	Tue Nov 23 17:52:38 2021 -0800
+++ b/mercurial/extensions.py	Fri Nov 26 16:51:58 2021 +0100
@@ -282,6 +282,7 @@
     result = ui.configitems(b"extensions")
     if whitelist is not None:
         result = [(k, v) for (k, v) in result if k in whitelist]
+    result = [(k, v) for (k, v) in result if b':' not in k]
     newindex = len(_order)
     ui.log(
         b'extension',