Add test and fix comment

crates/bevy_ecs/src/query/filter.rs

@@ -452,7 +452,7 @@ macro_rules! impl_or_query_filter {
                     $filter::update_component_access($filter, &mut intermediate);
                     _new_access.append_or(&intermediate);
                     // Also extend the accesses required to compute the filter. This is required because
-                    // otherwise a `Query<(), Changed<Foo>>` won't conflict with `Query<&mut Foo>`.
+                    // otherwise a `Query<(), Or<(Changed<Foo>,)>` won't conflict with `Query<&mut Foo>`.
                     _new_access.extend_access(&intermediate);
                 )*
 

crates/bevy_ecs/src/system/mod.rs

@@ -808,6 +808,15 @@ mod tests {
         run_system(&mut world, sys);
     }
 
+    #[test]
+    #[should_panic]
+    fn changed_trackers_conflict() {
+        fn sys(_: Query<&mut A>, _: Query<(), Or<(Changed<A>,)>>) {}
+
+        let mut world = World::default();
+        run_system(&mut world, sys);
+    }
+
     #[test]
     fn query_set_system() {
         fn sys(mut _set: ParamSet<(Query<&mut A>, Query<&A>)>) {}