KinematicBody2D is_on_floor() and is_on_wall() are refusing to return true on the same frame when using small vector values

[rainlizard]

Godot version: v3.2.4.rc3
OS/device including version: Windows 8.1
Issue description:

extends KinematicBody2D
var motion = Vector2()

func _physics_process(delta):
	motion += Vector2(1,1)
	motion = move_and_slide(motion, Vector2.UP)
	
	for i in get_slide_count():
		print(get_slide_collision(i).collider.name)
	print('WALL COLLISION: ' + str(is_on_wall()))
	print('FLOOR COLLISION: ' + str(is_on_floor()))
	print('----------------------------------')

The Godot icon moves into the two walls, then prints this, flipping back and forth:

South Wall
WALL COLLISION: False
FLOOR COLLISION: True
----------------------------------
East Wall
WALL COLLISION: True
FLOOR COLLISION: False
----------------------------------

If you replace the line motion += Vector2(1,1) with motion += Vector2(5,5) they will now return true on the same frame. No idea what's going on.

Here's the minimal reproduction project:
physics_on_wall_on_floor_bug.zip

[pouleyKetchoupp]

Thanks! I can confirm on both 3.2.3 and 3.2.4.rc3.

[Calinou]

See Shfty's character movement manifesto for a workaround:

• Unstable floor results make my 'is grounded' flag jitter
  • This seems to be down to the collision margin system
  • Use a rolling window (2-3 frames should be sufficient) that folds down to a single bool using OR to de-noise the floor check

[pouleyKetchoupp]

Fixed on master with the new CharacterBody logic (confirmed on 6877ccc but not sure which PR).