nested Packed Arrays serialize as a generic Array once a value inside is edited

[ajreckof]

Godot version

4.1.dev (a7276f1)

System information

MacOS 13.3 M1 Pro

Issue description

This issue was found by @don-tnowe while testing #76078
When nesting a Packed Array in an Array or a Dictionary and then updating one of the element of the Packed array, the packed Array will be recasted to an untyped Array.

Steps to reproduce

1. export an Array or dictionary
2. create an item in your Array/Dictionary with a PackedArray setup
3. add an item to the PackedArray and modify it
4. refresh the EditorProprety of your Array/Dict by closing it and reopening it
5. see that now your PackedArray is an Array

Minimal reproduction project

N/A