Godot version: Godot 4.0.custom 8cb6d5d (likely post poolvector removal)

OS/device including version:
Ubuntu Linux 18.04.4 LTS

Issue description:
In GDScript, packed arrays of base types (e.g. PackedByteArray, PackedFloat32Array, etc), seems to all share the same underlying resource (addressing issue? copy-on-write? ...)

Steps to reproduce/Minimal reproduction project:

extends Node2D

func _ready():
	var b1 = PackedByteArray()
	b1.append(2)
	var my_var = PackedByteArray()
	my_var.resize(3)

	var f1 = PackedFloat32Array()
	f1.append(2)
	var f2 = PackedFloat32Array()
	f2.resize(4)

	printt(b1.size(), my_var.size()) # Prints (3, 3) , should be (1, 3)
	printt(f1.size(), f2.size()) # Prints (4, 4) , should be (1, 4)

Potentially related to #36611 , #36779