Since 1.2 (Better Together) Update, Player Head on Third Person uses a different animation when compared to 1.1.5, on 1.2 and newer the Player Head instantly snap to camera rotation, while on 1.1.5 and below the Player Head has a slightly delay (or lag behind) before finally matching the camera rotation

Step to Reproduce:
1. Go to Third Person Back/Front
2. Now move your camera

Expected Result:
Player Head has a slightly delay (or lag behind) before finally matching the camera rotation, just like in 1.1.5 and below

Observed Result:
Player Head instantly snap to camera rotation

Note: This is not the same issue as MCPE-129268