The shield projector is able to accept a shape card to deploy itself without being next to shield template blocks, but using that shape card is quite annoying.

Currently, the only way to use it is to place a builder at the projector's location, and start the selection process with that builder, or to manually apply bounds in the gui.

The shape card should be able to start the selection process on a shield projector instead of responding "you can only do this on a builder." Makes sense for the other cards, but not for the shape card.

Any chance this could be fixed? Still an issue on 1.18

This is not really a bug is it? Just a missing feature. You can easily edit the coordinates yourselves. I might fix it at some point but it's low priority