Everything about the Predalien chestburster and its birth is wrong but that already started with the last movie.
Just to list some of the issues:
Scar doesn't realize he is facehugged or he just doesn't care.
The Queen doesn't care about killing an infected host (probably last of her kind surviving on Earth?).
A stab through the chest with a massive tail doesn't kill the Predalien chestburster
The Predators with "Chestburster vision" don't realize Scar is infected or just don't care.
The Predators wear full "war gear" inside their ships
The Predators use their shoulder cannon in their fragile ship, making it crash
A Predator decides to call for Wolf's help, even he could just as easily activate to self-destruct (is he hoping to survive?)