ImageTexture fails to "create_from_image" with error "Invalid image: image is empty" from an Image generated by one or more GradientTexture1D stored in an array

### Tested versions

Godot 4.2

### System information

Godot v4.2.stable - Windows 10.0.22631 - Vulkan (Forward+) - dedicated AMD Radeon RX 6700 XT (Advanced Micro Devices, Inc.; 31.0.22024.3) - AMD Ryzen 7 7700X 8-Core Processor (16 Threads)

### Issue description

I am trying to combine multiple GradientTexture1D gradients into a array to generate an image to texture a planet.
using the code below, how while i can read the data and generate an "Image" i cant generate an ImageTexture...
it trows the error "Invalid image: image is empty" while the "data" that is needed is apparently read extracted and valid...
Unless i am making a mistake the code below should work.

```gdscript
func update_biome_texture() -> ImageTexture:
var image_texture = ImageTexture.new()
var dyn_image = Image.new()
var h : int = biomes.size()
if h > 0:
var w : int = biomes[0].gradient.width
var data : PackedByteArray
for b in biomes:
var gradient_image = b.gradient.get_image()
if gradient_image.get_width() > 0 and gradient_image.get_height() > 0:
data.append_array(gradient_image.get_data())
if data.size() > 0:
dyn_image.create_from_data(w, h, false, Image.FORMAT_RGBA8, data)
image_texture.create_from_image(dyn_image)
image_texture.resource_name = "biome texture"
else:
print("Error: Gradient data is empty.")
return image_texture
```

### Steps to reproduce

Boot up the MRP.

1. Go from main to planet.
2. Click on the Planet object in the scene.
3. Open the PlanetData.gd script (the code is in there)
4. Search for "func update_biome_texture()" (to find the code)
5. in the inspector, toggle the "dev_code_or_data_edit_mode" bool.
(this should force the project to regenerate the planet object and try to load and apply a texture)
6. you have your error.

### Minimal reproduction project (MRP)

[Dark Stars.zip](https://github.com/godotengine/godot/files/14547335/Dark.Stars.zip)