Root nodes join through ModRoot.AddDeferred, so a reload that unloads the mod first never hands Godot a freed node

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

test_suites/gdscript/src/GdscriptTest.cs

@@ -24,7 +24,7 @@ namespace Mods.DialogBase.Tests
                 return;
             queued = true;
             GameLogger.Log("TEST", "GdscriptTest: activating");
-            (Godot.Engine.GetMainLoop() as SceneTree)?.Root?.CallDeferred("add_child", new GdscriptTestDriverNode());
+            ModRoot.AddDeferred(new GdscriptTestDriverNode());
         }
     }