RigidBody2D bounces when passing on top of two perfectly aligned StaticBody2Ds

Question

When creating two StaticBody2Ds, no matter how well aligned they are, a RigidBody2D passing over them will jump upwards sometimes. I expected the RigidBody2D to just roll over the connection since there is no gap at all, but it jumps instead.

The video below shows the issue, with debug collision shapes visible:

Here's the full code to reproduce; Just create a new project and attach the code to a Node2D:

extends Node2D

const STATIC_SIZE = 2000
onready var img = preload('res://icon.png')

func _ready():
    var rb := RigidBody2D.new()

    var s = Sprite.new()
    s.texture = img

    rb.add_child(s)

    # Add a circle shaped collision
    var rb_col := CollisionShape2D.new()
    rb_col.shape = CircleShape2D.new()
    rb_col.shape.radius = 50
    rb.add_child(rb_col)

    # Configure to have no friction and no damp
    rb.linear_damp = 0
    rb.physics_material_override = PhysicsMaterial.new()
    rb.physics_material_override.friction = 0

    # apply impulse
    rb.apply_impulse(Vector2.ZERO, Vector2(1050, 0))

    # follow with a camera
    var camera := Camera2D.new()
    camera.current = true
    rb.add_child(camera)

    add_child(rb)

    # create 10 consecutive StaticBody2D perfectly aligned
    var pos := Vector2(STATIC_SIZE / 2, 200)
    for x in range(0, 10):
        var ground := StaticBody2D.new()
        var ground_col := CollisionShape2D.new()
        ground_col.shape = RectangleShape2D.new()
        ground_col.shape.extents = Vector2(STATIC_SIZE / 2, 100)
        ground.add_child(ground_col)

        # Add a sprite so we can see where the division is
        s = Sprite.new()
        s.position = Vector2(-STATIC_SIZE/2, -50)
        s.texture = img
        ground.add_child(s)

        ground.position = pos
        add_child(ground)

        pos.x += STATIC_SIZE

Comments

I have tried with square shape and capsule shape, all of them present the issue