Issue #10756: atexit normalizes the exception before displaying it.
diff --git a/Modules/atexitmodule.c b/Modules/atexitmodule.c
index 1382133..1ee7ead 100644
--- a/Modules/atexitmodule.c
+++ b/Modules/atexitmodule.c
@@ -72,6 +72,7 @@
             PyErr_Fetch(&exc_type, &exc_value, &exc_tb);
             if (!PyErr_ExceptionMatches(PyExc_SystemExit)) {
                 PySys_WriteStderr("Error in atexit._run_exitfuncs:\n");
+                PyErr_NormalizeException(&exc_type, &exc_value, &exc_tb);
                 PyErr_Display(exc_type, exc_value, exc_tb);
             }
         }