### 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)

--texture_binding;
									if (String(shader_type_identifier) != "spatial") {
										_set_error(vformat(RTR("'hint_depth_texture' is not supported in '%s' shaders."), shader_type_identifier));
										return ERR_PARSE_ERROR;
									}
								} break;
								case TK_FILTER_NEAREST: {
									new_filter = FILTER_NEAREST;
								} break;
								case TK_FILTER_LINEAR: {
									new_filter = FILTER_LINEAR;
								} break;
								case TK_FILTER_NEAREST_MIPMAP: {
									new_filter = FILTER_NEAREST_MIPMAP;
								} break;
								case TK_FILTER_LINEAR_MIPMAP: {
									new_filter = FILTER_LINEAR_MIPMAP;
								} break;
								case TK_FILTER_NEAREST_MIPMAP_ANISOTROPIC: {
									new_filter = FILTER_NEAREST_MIPMAP_ANISOTROPIC;
								} break;
								case TK_FILTER_LINEAR_MIPMAP_ANISOTROPIC: {
									new_filter = FILTER_LINEAR_MIPMAP_ANISOTROPIC;
								} break;
								case TK_REPEAT_DISABLE: {
									new_repeat = REPEAT_DISABLE;
								} break;
								case TK_REPEAT_ENABLE: {
									new_repeat = REPEAT_ENABLE;
								} break;