Unreal Enging Bug StateTrees require manual recompilation in editor on every load https://forums.unrealengine.com/t/ue-5-5-statetrees-require-manual-recompilation-in-editor-on-every-load-statetrees-fail-in-packaged-builds/2156121 Edit Engine/Plugins/Runtime/StateTree/StateTree.uplugin set StateTreeEditorModule.LoadingPhase to PreDefault