### 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();
			int sign = 1;
			if (tk.type == TK_OP_SUB) {
				sign = -1;
				tk = _get_token();
			}
			Node *n = nullptr;
			if (!tk.is_integer_constant()) {
				bool correct_constant_expression = false;
				DataType data_type;
				if (tk.type == TK_IDENTIFIER) {
					bool is_const;
					_find_identifier(p_block, false, p_function_info, tk.text, &data_type, nullptr, &is_const);
					if (is_const) {
						if (data_type == TYPE_INT) {
							correct_constant_expression = true;
						}
					}
				}
				if (!correct_constant_expression) {
					_set_error(RTR("Expected an integer constant."));
					return ERR_PARSE_ERROR;
				}
				VariableNode *vn = alloc_node<VariableNode>();
				vn->name = tk.text;
				n = vn;
			} else {
				ConstantNode::Value v;