Fix AnimationBlendTree reset on resource loading

When reset_state was called on an existing AnimationBlendTree, the
output node would disappear, causing some errors in the editor and
preventing animations to play properly.

This change ensures the output node is always present in the node tree.

2 files changed, 8 insertions, 1 deletions

diff --git a/scene/animation/animation_blend_tree.cpp b/scene/animation/animation_blend_tree.cpp
index 049f3483ff..d11387902a 100644
--- a/scene/animation/animation_blend_tree.cpp
+++ b/scene/animation/animation_blend_tree.cpp
@@ -1124,6 +1124,7 @@ void AnimationNodeBlendTree::_get_property_list(List<PropertyInfo> *p_list) cons
 void AnimationNodeBlendTree::reset_state() {
 	graph_offset = Vector2();
 	nodes.clear();
+	_initialize_node_tree();
 	emit_changed();
 	emit_signal(SNAME("tree_changed"));
 }
@@ -1162,7 +1163,7 @@ void AnimationNodeBlendTree::_bind_methods() {
 	BIND_CONSTANT(CONNECTION_ERROR_CONNECTION_EXISTS);
 }
 
-AnimationNodeBlendTree::AnimationNodeBlendTree() {
+void AnimationNodeBlendTree::_initialize_node_tree() {
 	Ref<AnimationNodeOutput> output;
 	output.instantiate();
 	Node n;
@@ -1172,5 +1173,9 @@ AnimationNodeBlendTree::AnimationNodeBlendTree() {
 	nodes["output"] = n;
 }
 
+AnimationNodeBlendTree::AnimationNodeBlendTree() {
+	_initialize_node_tree();
+}
+
 AnimationNodeBlendTree::~AnimationNodeBlendTree() {
 }
diff --git a/scene/animation/animation_blend_tree.h b/scene/animation/animation_blend_tree.h
index 8508aaf71b..258443a999 100644
--- a/scene/animation/animation_blend_tree.h
+++ b/scene/animation/animation_blend_tree.h
@@ -345,6 +345,8 @@ class AnimationNodeBlendTree : public AnimationRootNode {
 	void _tree_changed();
 	void _node_changed(const StringName &p_node);
 
+	void _initialize_node_tree();
+
 protected:
 	static void _bind_methods();
 	bool _set(const StringName &p_name, const Variant &p_value);