### 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)

code += "blend_mul";
			break;
		case BLEND_MODE_MAX:
			break; 
	}
	DepthDrawMode ddm = depth_draw_mode;
	if (features[FEATURE_REFRACTION]) {
		ddm = DEPTH_DRAW_ALWAYS;
	}
	switch (ddm) {
		case DEPTH_DRAW_OPAQUE_ONLY:
			code += ",depth_draw_opaque";
			break;
		case DEPTH_DRAW_ALWAYS:
			code += ",depth_draw_always";
			break;
		case DEPTH_DRAW_DISABLED:
			code += ",depth_draw_never";
			break;
		case DEPTH_DRAW_MAX:
			break; 
	}
	switch (cull_mode) {
		case CULL_BACK:
			code += ",cull_back";
			break;
		case CULL_FRONT:
			code += ",cull_front";
			break;
		case CULL_DISABLED: