Autocompletion not working on children

[kadincool]

Godot version

v4.0.alpha14.official [106b680]

System information

Windows 10

Issue description

when running functions in a child defined in a variable, it should autofill functions specific to that child type (e.g. move_and_slide for a character body)

Steps to reproduce

1. create a node
2. add a kinematic body with a collider child
3. to the first node, attach an empty script and add:
   @onready var child := $CharacterBody3D
#effect child by gravity
func _physics_process(delta):
child.velocity.y -= 9.8 * delta
child.move_and_slide()
   when typing child.velocity.y -= 9.8 * delta and child.move_and_slide(), it does not autofill the appropriate functions "velocity" and "move_and_slide()" nor understand that velocity is a vector when they are part of a child variable

Minimal reproduction project

No response

[KoBeWi]

Seems like combination of #53318 and #44480