diff --git a/test_runner/regress/test_timeline_detach_ancestor.py b/test_runner/regress/test_timeline_detach_ancestor.py
index 214e10c32e..1e961a4b2f 100644
--- a/test_runner/regress/test_timeline_detach_ancestor.py
+++ b/test_runner/regress/test_timeline_detach_ancestor.py
@@ -58,6 +58,8 @@ class Branchpoint(str, enum.Enum):
 SHUTDOWN_ALLOWED_ERRORS = [
     ".*initial size calculation failed: downloading failed, possibly for shutdown",
     ".*failed to freeze and flush: cannot flush frozen layers when flush_loop is not running, state is Exited",
+    ".*logical_size_calculation_task:panic.*: Sequential get failed with Bad state \\(not active\\).*",
+    ".*Task 'initial size calculation' .* panicked.*",
 ]