C# [Export] Arrays not working on IOS builds 4.3 Beta

### Tested versions

Reproducible on 4.3 Beta 2 and 4.3 Beta 3
Not tested on other versions yet
NOTE **THIS IS C# SPECIFIC** - GDSCRIPT seems to be fine.

### System information

Godot v4.3.beta3.mono - Windows 10.0.19045 - GLES3 (Compatibility) - NVIDIA GeForce RTX 3080 (NVIDIA; 32.0.15.6070) - AMD Ryzen 9 5950X 16-Core Processor (32 Threads)

### Issue description

Tracked this down by use of GD.Prints.

This is in C#. I have Arrays which are marked as "Export" which are filled in with the editor. These work fine in windows and android Builds.

On IOS build, if I build it the built code says the array is of size 0.

### Steps to reproduce

In C#. Have an array of any type, which is exported and filled in the editor. For example, the way I found this bug was as follows.
```
[Export]
public Array buttons = new Array();
```

In the editor, add a couple of buttons to this array.

Then in the C# code, have something like :

GD.Print("Number of Buttons : " + buttons.Count);

When you run the code on Windows/Mac/Android - you'll get a debug log saying "Number of Buttons : 2" (or however many you added).

**HOWEVER..** On IOS, you'll get 0.

This will happen with ANY godot type added to array in the editor.

Also happens the exact same with the following code:

[Export]`public DrawNode2D[] subDrawNodes2 = null;`

### Minimal reproduction project (MRP)

EDIT: Added a small repro below.

[iosbug.zip](https://github.com/user-attachments/files/16355079/iosbug.zip)

Start by opening the attached iosbug.zip minimal reproduction project and reproduce the exported C# array behavior on an iOS build, comparing it with Windows or Android. The fix is complete when Godot types added to exported C# arrays are preserved on iOS and the reported count matches the editor contents.

Written by the indexing model from the issue text.