### 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 (member_count == 0) {
					_set_error(RTR("Empty structs are not allowed."));
					return ERR_PARSE_ERROR;
				}
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_UNSPECIFIED;
#endif 
				tk = _get_token();
				if (tk.type != TK_SEMICOLON) {
					_set_expected_error(";");
					return ERR_PARSE_ERROR;
				}
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_GLOBAL_SPACE;
#endif 
				shader->structs[st.name] = st;
				shader->vstructs.push_back(st); 
#ifdef DEBUG_ENABLED
				if (check_warnings && HAS_WARNING(ShaderWarning::UNUSED_STRUCT_FLAG)) {
					used_structs.insert(st.name, Usage(tk_line));
				}
#endif 
			} break;
			case TK_GLOBAL: {
#ifdef DEBUG_ENABLED
				keyword_completion_context = CF_UNIFORM_KEYWORD;
				if (_lookup_next(next)) {
					if (next.type == TK_UNIFORM) {