printf-mb.log ( failed)

test link: tests/printf/printf-mb.sh
FAIL: tests/printf/printf-mb
============================

--- exp	2025-06-05 10:18:35.481817240 +0000
+++ out	2025-06-05 10:18:35.479817223 +0000
@@ -1,5 +1,5 @@
 00e1
+fffd
+fffd
 00e1
-00e1
-00e1
-00e1
+fffd
FAIL tests/printf/printf-mb.sh (exit status: 1)