This ticket closely relates to MC-171456 - if this is considered Invalid, that one probably is as well.

The bug

Unlike several other blocks, cakes do not have a block state that handles facing direction associated with them. As a result, cakes will always be eaten towards the east, regardless of the player's direction.

How to reproduce

1. Place a cake while facing one direction
2. Eat this cake while facing that direction
3. Place another cake while facing another direction
4. Also eat this cake while facing this new direction
5. Continue to lie to yourself that you aren't just using "testing a Minecraft bug" as an excuse to eat more cake

Expected results

The direction in which bites are taken out of the cake would differ in each situation.

Actual results

The direction in which the cake depletes is constant, and often illogical.

How to fix

A "facing" block state could be added to cake to track a compass direction, which would also change the direction the bites get taken from. This direction could be a fixed value when the cake is placed, or it could change to the eater's direction once the first bite is taken (in a similar fashion to opening and closing fence gates), however this second solution may require more models to be created to prevent textures from jumping and shifting unnaturally.