### Godot version

v4.1.dev.custom_build.a7276f1ce

### System information

Win10, AMD 2600, GeForce GTX 1060, Vulkan API 1.3.205

### Issue description

I can't get correct color data from an array of source_color type.
The color data is saved as **Color** in the file:
`shader_parameter/palette = [Color (1, 0, 0, 1), Color (0, 1, 0, 1), Color (0, 0, 1, 1)]`
Shouldn't it be saved as PackedColorArray?


### Steps to reproduce

1.Declare an array of source_color type.
2.Set colors.

### Minimal reproduction project

[shadertest.zip](https://github.com/godotengine/godot/files/11246504/shadertest.zip)

if ((uint32_t)ubo_data.size() != p_ubo_size) {
		p_uniform_dirty = true;
		if (!uniform_buffer) {
			glGenBuffers(1, &uniform_buffer);
		}
		ubo_data.resize(p_ubo_size);
		if (ubo_data.size()) {
			memset(ubo_data.ptrw(), 0, ubo_data.size()); 
		}
	}