Restricted Access not working in 3.4.12?

I’m trying to add some pieces to my module which are supposed to only be able to be moved or right-clicked by the owning player. I added a Restricted Access trait, and assigned the appropriate side. This works, except that the setup is all done automatically by a single player, so that player also needs to be able to move the pieces. Therefore, I checked the “Also belongs to initially-placing player” checkbox, so that player could move them to the correct location. Now, suddenly, every player is able to drag the piece and access the right-click menu!

So, as far as I can tell, the “Also belongs to initially-placing player” checkbox completely disables the trait. Am I doing something wrong?

BTW, these pieces are being added in an extension, not the main module, if that makes any difference.