Clear iso scope if propagate_scope is False

Author: sentrivana

sentry_sdk/integrations/threading.py

@@ -115,7 +115,8 @@ def _run_old_run_func():
                 with sentry_sdk.use_scope(current_scope_to_use):
                     return _run_old_run_func()
         else:
-            with sentry_sdk.isolation_scope():
+            with sentry_sdk.isolation_scope() as scope:
+                scope.clear()
                 return _run_old_run_func()
 
     return run  # type: ignore