Wandering trader llamas despawn if you move more than 54 blocks away from them

The bug

Llamas leashed to the wandering trader will despawn if you move more than 54 blocks away from the trader. 

Steps to reproduce

1. Spawn a wandering trader. There should be two llamas leashed to the trader

2. Move more than 54 blocks away from the wandering trader

3. Come back to where the you spawned the wandering trader

4. The llamas should despawn leaving only the wandering trader

Observed Results

The wandering trader llama despawns if you move more than 54 blocks away. 

Expected Results

The trader llamas should not despawn if you move more than 54 blocks away