### 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)

keyword_completion_context ^= CF_UNIFORM_KEYWORD;
					}
				}
#endif 
				tk = _get_token();
				if (tk.type != TK_UNIFORM) {
					_set_expected_after_error("uniform", "global");
					return ERR_PARSE_ERROR;
				}
				uniform_scope = ShaderNode::Uniform::SCOPE_GLOBAL;
			};
				[[fallthrough]];
			case TK_INSTANCE: {
				if (tk.type == TK_INSTANCE) {
#ifdef DEBUG_ENABLED
					keyword_completion_context = CF_UNIFORM_KEYWORD;
					if (_lookup_next(next)) {
						if (next.type == TK_UNIFORM) {
							keyword_completion_context ^= CF_UNIFORM_KEYWORD;
						}
					}
#endif 
					if (String(shader_type_identifier) != "spatial") {
						_set_error(vformat(RTR("Uniform instances are not yet implemented for '%s' shaders."), shader_type_identifier));
						return ERR_PARSE_ERROR;
					}
					if (OS::get_singleton()->get_current_rendering_method() == "gl_compatibility") {
						_set_error(RTR("Uniform instances are not supported in gl_compatibility shaders."));
						return ERR_PARSE_ERROR;
					}