Personally I never encountered this problem and I played through the prologue hundreds of times.
Patch 8 did create plenty of bugs with followers, including them going missing and not following, but Patch 7 had none of the issues that Patch 8 now has.
Is there anything specific that causes Lae'zel to stop following? Sneaking on the Nautiloid or clicking the button to warp while sneaking ? I could test if there's anything specific that triggers it, but I never had this issue despite the different ways of beating the prologue.
