Should AnimatedSprite.frame_changed ALWAYS be emitted when animation changes?

[Mickeon]

The question above is simple.
I'm asking this because there has been a bunch of occasion where I had to emit the function tied to the frame_changed signal manually after play(), because otherwise there's a animation delay for the code I expected to be updated on frame change, but doesn't actually happen because between the animation change, the frame index is the same.

Example:

Notice the signal isn't emitted on frame 0, the first frame of the new animation:

I looked at the code, and it would seem like the reason for it, again, is because, between animation switches, frame 0 and frame 0 is the same, and the code is optimised to not emit the signal in that case.