### 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)

if (p_test_only) {
					playback = playback->duplicate();
				}
				if (i > 0) {
					playback->_start(anodesm.ptr());
				}
				if (i >= new_path.size()) {
					break; 
				}
				playback->_travel_main("End");
				if (!playback->_travel(p_tree, anodesm.ptr(), false, p_test_only)) {
					found_route = false;
					break;
				}
			}
			if (i >= new_path.size()) {
				break; 
			}
			current_path = new_path[i];
		}
	}
	
	if (found_route) {
		r_path = new_path;
		return true;
	} else {
		return false;
	}
}
double AnimationNodeStateMachinePlayback::process(const String &p_base_path, AnimationNodeStateMachine *p_state_machine, double p_time, bool p_seek, bool p_is_external_seeking, bool p_test_only) {