Mouse motion is captured only when a mouse button is pressed

UnitedCatdom can you explain more?

For me it works fine

I have a script:

extends Control

@onready var mouse_motion: Label = $Debug/VBoxContainer/MouseMotion
var timer = Timer.new()

func _input(event):
	if event is InputEventMouseMotion:
		mouse_motion.text = "Mouse_motion = true"
		timer.start()
		
func _ready() -> void:
	timer.autostart=false
	timer.wait_time = 1.0
	timer.timeout.connect(on_timer_timeout)
	add_child(timer)
	pass
func on_timer_timeout():
	mouse_motion.text = "Mouse_motion = false"

When i move mouse it sets text to true, after i stop moving, timer starts, after 1 sec it sets text to false, if i tab out the window, mouse is not capture no more and if i tab in and move mouse the func _input() gets triggered again. All the clicking i need to do is to click the game window to make it active again and move my mouse.