From 1d7c44af2542ec28cf7b5bec56d84a2e27077f48 Mon Sep 17 00:00:00 2001
From: Aevyrie Roessler <aevyrie@gmail.com>
Date: Fri, 28 Feb 2025 22:23:21 -0800
Subject: [PATCH] Only require panic on cycle test for potentially unsound
 system.

---
 crates/bevy_transform/src/systems.rs | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/crates/bevy_transform/src/systems.rs b/crates/bevy_transform/src/systems.rs
index 0c98485706..7b1a27fcec 100644
--- a/crates/bevy_transform/src/systems.rs
+++ b/crates/bevy_transform/src/systems.rs
@@ -873,12 +873,10 @@ mod test {
 
         app.add_systems(
             Update,
-            (
-                mark_dirty_trees,
-                propagate_parent_transforms,
-                sync_simple_transforms,
-            )
-                .chain(),
+            // It is unsound for this unsafe system to encounter a cycle without panicking. This
+            // requirement only applies to systems with unsafe parallel traversal that result in
+            // aliased mutability during a cycle.
+            propagate_parent_transforms,
         );
 
         fn setup_world(world: &mut World) -> (Entity, Entity) {