The bug

If you look closely at a compass item (no matter whether it's an item entity or held by another entity), you will notice that the back side of the compass actually points into an incorrect direction. When it should point up, it points down, and vice-versa. When looking at the front side of the compass, it acts correctly.

The back side of a compass probably just takes the position of the needle on the front side and mirrors it, while it should flip it too.

To reproduce

1. Place a lodestone
2. Use a compass on the lodestone
3. Drop the compass
   → 50% of the time, the needle will point into an incorrect direction.

Videos

• Compass items on the ground: Minecraft 20w17a - Singleplayer 2020-04-26 17-28-29.mp4
• A husk holding a compass in its hand: Minecraft 20w17a - Singleplayer 2020-04-26 17-27-00.mp4