Extended prologue

There could be some scenes that was longer when shot, that dont even make it to the DVD/Blu-ray Extras.

Prometheus had a number of Scenes not even on the Extras, and even some Alternative and Extended Scenes that also never made it to the Extras.

I would assume maybe the same could be the case with Alien Covenant.

The cynic in me thinks they are waiting to release scenes on future blue rays- the special edition, the authoritative edition, the super duper edition, the parents' basement dwellers' edition etc...