In Alien: Covenant we learn that David has been experimenting with, and modifying, the engineers bio technology, and in doing so created the face huggers which are vital to the alien lifecycle.
In other alien sequels we see the alien queen laying eggs/face huggers. Given that no queen appears in Covenant David must have produced the face huggers by other means.
Have queens been effectively retconned out of canon by Covenant?
There's a hint in Advent that David is working to create the queen:
There is one thing left to perfect. My queen.
However I was under the impression that the xenomorphs were effectively a reset button, not David's ultimate goal. Given xenomorphs need hosts to reproduce, having them reproduce boundlessly seems self defeating, and far from the perfection David aspires to.