Info here is outdated. Please check my comment on MCPE-37207.

Description: While climbing a slope, minecart is visually sinking 0.5 block into ground every time it climbs a block whose Y axis value equals 2^n. tested values: Y:15->Y:16; Y:31->Y:32; Y:63->Y:64.

Condition: When I take a minecart down the slope, it does not glitch when returning back up. The glitch happens only if the minecart originated at the bottom of the slope. However, reloading the game resets the minecart state and therefore the cart will glitch during the climb even if you came down using that minecart before reloading the game.

Quick steps to reproduce:

1. Create a 45° sloped rail line from Y value (height) 20 to 40.
2. Place a minecart at the bottom of the rail and ride the cart to the top.

Observation:

The cart will sink half a block as soon as it climbs Y:32.

Further observations:

1. Notice that the coordinate on the 1st attached picture displays Y value of 62 even though standing on the minecart there displays y value 64. That cart started below Y:32 and has sunk twice. Even though visually it sinks only half a block every time, the data value shows otherwise.

2. This can happen repeatedly and sink the minecart further into the ground.

3. The sunken minecart sinks further into ground if attempt is made to recvover it from above. It must be recovered by digging under it.

4. After reloading the game, the minecart returns to its normal position above ground.

5. Going a few blocks downhill does not fix a glitched car.

6. This happens on both survival and creative mode.

7. This glitch does not depend on the direction of the rail line. It happens across both North-South and East-West rail lines.

8. If the glitched cart attempst to jump down on rails that are two blocks below its current track, it fails to land on the bottom track and becomes a floating ghost cart in the air.