Confirmed that this is still an issue in 1.7.10. When a cart is spawned on an incline the y axis of the player is 0.469 lower than it should be.
The y axis of the player whilst riding the cart will correct itself exactly 60 seconds after the cart is spawned.
This seems to be the case irrespective of whether the cart has been entered or not; i.e. if riding in the cart, at 60 seconds the y axis will be corrected. If the cart is spawned and left for >60 seconds and then entered, the player will be positioned at the correct y axis as soon as they enter.
Aleks Huson
Confirmed that this is still an issue in 1.7.10. When a cart is spawned on an incline the y axis of the player is 0.469 lower than it should be.
The y axis of the player whilst riding the cart will correct itself exactly 60 seconds after the cart is spawned.
This seems to be the case irrespective of whether the cart has been entered or not; i.e. if riding in the cart, at 60 seconds the y axis will be corrected. If the cart is spawned and left for >60 seconds and then entered, the player will be positioned at the correct y axis as soon as they enter.