So there are two bugs that i have found while playing with my brother on the same device:

1. A second player is unable to see an Ender Dragon as well as Ender Crystal, while the first player can see them properly. He can still attack Ender Dragon and Destroy the Crystals

2. A second player sometime is missing some animations. His character is not moving his legs while walking, and hands while mining/attacking. Sometimes a screen flickers which alows him to have them for some peroid of time. Whenever Player 2 loses his animations again, if he had an armour on him and was during some animation like walking, his armour becomes frozen in pose he was during that time which results in him not moving his limbs, and his armour is phasing threw his body