I think it has to do with the fact the devs butchered the game physics in Anniversary Edition and after.
There is a clear regression regarding :
- bodies stopping their animation in mid-air, like you said
- items that bounce for a very long time after they drop
- monster bodies or projectiles than go through the ground (like turtles, yetis...)
- ragdoll optimization, particularly in act 5 and Atlantis, causing a loss of performance (not the only cause)