Area2D erroneously emits body_entered signal if collision mask *and* layer are reset.

[Whateverest]

Godot version: v3.2.3

OS/device including version: Linux 5.10.2-2-MANJARO

Issue description:
I have an obstacle (Area2D) that "destroys" the player character(KinematicBody2D) on contact using the body_entered signal. I then hide the player, disable the collisions and start a timer.
I disable collisions by using:

set_collision_layer_bit(0,false)
set_collision_mask_bit(0,false)

After the timer has run out the player respawns at the start location. I do this by resetting the position and re-enabling collisions.
When the player respawns the Area fires the body_entered signal again even though the player character does not collide with the area anymore .

This problem only appears if I reset both the collision layer and the mask.
If I reset only one of those it somehow works.

Did I stumble upon a Bug or is this documented behavior?

Other users seem to have a similar problem: https://godotengine.org/qa/56193/how-to-manually-set-the-position-of-a-kinematicbody2d

Steps to reproduce:

1. Have a body enter an area (body_entered signal is emitted)
2. Disable collisions and start a timer
3. On timeout: Set the position of the body to somewhere outside the area and re-enable collisions
4. body_entered is emitted again

Minimal reproduction project:
collission_example.zip

[Calinou]

Related to #14578, #19271 and #25769.

[Whateverest]

Thanks for the issues, #14578 (comment) contains a workaround for the problem.
Calling yield(self.get_tree(), "physics_frame") two times before re-enabling collisions seems to fix the issue.

[AttackButton]

Sorry. I've tested it more and this still is a bug related with #14578.

[AttackButton]

Thanks for the issues, #14578 (comment) contains a workaround for the problem.
Calling yield(self.get_tree(), "physics_frame") two times before re-enabling collisions seems to fix the issue.

The other workaround that I did find is to reconnect with the body_entered using the CONNECT_DEFERRED | CONNECT_ONESHOT every time the area is entered.

func _ready():
	$"../Area2D".connect("body_entered", self, "_on_Area2D_body_entered", [], CONNECT_DEFERRED | CONNECT_ONESHOT)
	start_pos = position


func _physics_process(delta):
	if dead:
		return
	move_and_slide(gravity)


func respawn():
	$"../Area2D".connect("body_entered", self, "_on_Area2D_body_entered", [], CONNECT_DEFERRED | CONNECT_ONESHOT)
	dead = false
	set_collision_layer_bit(0,true)
	set_collision_mask_bit(0,true)
	show()


func _on_Area2D_body_entered(body):
	if(body == self):
		dead = true
		set_collision_layer_bit(0,false)
		set_collision_mask_bit(0,false)
		hide()
		self.position = start_pos
		emit_signal("died",self)

[akien-mga]

See #69407 for a 4.0 MRP, where the issue is still reproducible.