### Godot version

v4.1.rc2.official [46424488e]

### System information

Godot v4.1.rc2 - Windows 10.0.22621 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3060 (NVIDIA; 31.0.15.3623) - AMD Ryzen 7 5700G with Radeon Graphics (16 Threads)

### Issue description

When setting the AnimationTree to active, Godot crashes.

### Steps to reproduce

https://github.com/godotengine/godot/assets/46705245/dbe5eb81-1357-43e8-ac80-a4eb97eea9fc

### Minimal reproduction project

[Crash.zip](https://github.com/godotengine/godot/files/11945826/Crash.zip)

return false;
}
bool AnimationNodeStateMachine::_get(const StringName &p_name, Variant &r_ret) const {
	String prop_name = p_name;
	if (prop_name.begins_with("states/")) {
		String node_name = prop_name.get_slicec('/', 1);
		String what = prop_name.get_slicec('/', 2);
		if (what == "node") {
			if (states.has(node_name) && can_edit_node(node_name)) {
				r_ret = states[node_name].node;
				return true;
			}
		}
		if (what == "position") {
			if (states.has(node_name)) {
				r_ret = states[node_name].position;
				return true;
			}
		}
	} else if (prop_name == "transitions") {
		Array trans;
		for (int i = 0; i < transitions.size(); i++) {
			String from = transitions[i].from;
			String to = transitions[i].to;
			trans.push_back(from);
			trans.push_back(to);
			trans.push_back(transitions[i].transition);
		}
		r_ret = trans;
		return true;