### 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)

return ERR_PARSE_ERROR;
								}
							}
							tk = _get_token();
						} else {
							if (constant.array_size > 0 || unknown_size) {
								_set_error(RTR("Expected array initialization."));
								return ERR_PARSE_ERROR;
							} else {
								_set_error(RTR("Expected initialization of constant."));
								return ERR_PARSE_ERROR;
							}
						}
						shader->constants[name] = constant;
						shader->vconstants.push_back(constant);
#ifdef DEBUG_ENABLED
						if (check_warnings && HAS_WARNING(ShaderWarning::UNUSED_CONSTANT_FLAG)) {
							used_constants.insert(name, Usage(tk_line));
						}
#endif 
						if (tk.type == TK_COMMA) {
							tk = _get_token();
							if (tk.type != TK_IDENTIFIER) {
								_set_error(RTR("Expected an identifier after type."));
								return ERR_PARSE_ERROR;
							}
							name = tk.text;
							if (_find_identifier(nullptr, false, constants, name)) {
								_set_redefinition_error(String(name));
								return ERR_PARSE_ERROR;