As confirmed by multiple users that were affected by the stuttering on landing, they are fixed in 3.5.9. But that doesn't mean 3.5.9 would auto-magically fix EVERY stuttering on landing you might have. It would ONLY fix it it YOUR stuttering on landing was the one caused by Livery Manager added in version 3.5.7 disabling the GSX replacement for the stock Pushback tug.
If you still have stuttering on landing and you DO have the default (replaced by GSX, but still default) Pushback visible, it means the update to 3.5.9 went fine, so your stutter on landing is NOT caused by GSX.
As you see here:
https://forums.flightsimulator.com/t/touch-down-stutters-su16/727324/58watched those videos and that is exactly how it looks like for me on Xbox Series X (no GSX)
and here:
https://forums.flightsimulator.com/t/touch-down-stutters-su16/727324/66Hi Not using GSX and getting a great deal of stutters and freezes which I didn’t have before
It's clear that stuttering can happen even without GSX or, of course, with GSX updated to 3.5.9, which surely fixed any stuttering caused by THAT particular issue (missing Pushback)ù
But when taxiing to the gate, I launch it, select the gate and taxi. But it no longer functions - constant loading.
Even if it's not required to disable GSX and to restart it, it still works and I can't reproduce this problem either. I restart GSX many times, never happened once.