### 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)

for (int i = 0; i < transitions.size(); i++) {
		if (transitions[i].from == p_from) {
			return true;
		}
	}
	return false;
}
bool AnimationNodeStateMachine::has_transition_to(const StringName &p_to) const {
	for (int i = 0; i < transitions.size(); i++) {
		if (transitions[i].to == p_to) {
			return true;
		}
	}
	return false;
}
int AnimationNodeStateMachine::find_transition(const StringName &p_from, const StringName &p_to) const {
	for (int i = 0; i < transitions.size(); i++) {
		if (transitions[i].from == p_from && transitions[i].to == p_to) {
			return i;
		}
	}
	return -1;
}
Vector<int> AnimationNodeStateMachine::find_transition_from(const StringName &p_from) const {