Parsed full screen click sees different input event

Help
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1

Godot Version

4.4

Question

I am simulating a click event when I press a button on my game controller. The event changes depending on my project size mode. Here is the code:

func _left_mouse_click() -> void:
	var joy_click := InputEventMouseButton.new()
	joy_click.button_index = MOUSE_BUTTON_LEFT
	joy_click.position = get_viewport().get_mouse_position()
	joy_click.pressed = true
	Input.parse_input_event(joy_click)

In windowed mode this is the event returned:

InputEventMouseButton: button_index=1, mods=none, pressed=true, canceled=false, position=((1291.0, 611.0)), button_mask=0, double_click=false

Maximized, Fullscreen or Exclusive Fullscreen see this:

InputEventMouseMotion: button_mask=1 (Left Mouse Button), position=((1270.53, 638.2177)), relative=((0.0, 0.0)), velocity=((0.0, 0.0)), pressure=0.00, tilt=((0.0, 0.0)), pen_inverted=(false)

The button mask info is enough for me to work around the change in behavior, but I am wondering -

Why would changing Project > Window > Size > Mode change the parsed input event?

In case it is relevant, the project size is 1920 x 1080. My monitor size is 2560 x 1440. The click target is an Area2D with a CollisionShape.