### 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)

}
			for (int i = 0; i < 4; i++) {
				expression.remove_at(next_op);
			}
		} else {
			if (next_op < 1 || next_op >= (expression.size() - 1)) {
				_set_parsing_error();
				ERR_FAIL_V(nullptr);
			}
			OperatorNode *op = alloc_node<OperatorNode>();
			op->op = expression[next_op].op;
			if (expression[next_op - 1].is_op) {
				_set_parsing_error();
				ERR_FAIL_V(nullptr);
			}
			if (_is_operator_assign(op->op)) {
				String assign_message;
				if (!_validate_assign(expression[next_op - 1].node, p_function_info, &assign_message)) {
					_set_error(assign_message);
					return nullptr;
				}
			}
			if (expression[next_op + 1].is_op) {
				
				
				
				
				_set_parsing_error();
			}
			op->arguments.push_back(expression[next_op - 1].node);