### Godot version

4.0.beta16

### System information

windows 10

### Issue description

whenever an animation starts playing and there is an animation track in it with at least one key, the seemingly innocuous error message gets printed:
```
ERROR: Condition "!playback.current.from" is true.
   at: seek (scene/animation/animation_player.cpp:1784)
```
It apparently doesn't cause any kind of erroneous behavior, and the other animation player seems to play the animation as expected.

### Steps to reproduce

see attached video:

https://user-images.githubusercontent.com/5783414/215481088-a0da14c0-fa1a-4921-b351-66257adb9a3a.mp4


### Minimal reproduction project

[PlayingAnimationTracksPrintsAnError.zip](https://github.com/godotengine/godot/files/10535868/PlayingAnimationTracksPrintsAnError.zip)

### Work Around

Instead of using animation playback tracks, the user can use method call tracks and call the play method in the desired animation player
_stop_internal(true, p_keep_state);
}
void AnimationPlayer::set_speed_scale(float p_speed) {
	speed_scale = p_speed;
}
float AnimationPlayer::get_speed_scale() const {
	return speed_scale;
}
float AnimationPlayer::get_playing_speed() const {
	if (!playing) {
		return 0;
	}
	return speed_scale * playback.current.speed_scale;
}
void AnimationPlayer::seek(double p_time, bool p_update) {
	if (!playback.current.from) {
		if (playback.assigned) {
			ERR_FAIL_COND_MSG(!animation_set.has(playback.assigned), vformat("Animation not found: %s.", playback.assigned));
			playback.current.from = &animation_set[playback.assigned];
		}
		ERR_FAIL_COND(!playback.current.from);
	}
	playback.current.pos = p_time;
	playback.seeked = true;
	if (p_update) {
		_animation_process(0);
	}
}
void AnimationPlayer::seek_delta(double p_time, double p_delta) {