After updating, I noticed the camera dipped lower when sneaking, so I went to a test world just to see if the 1.5 block sneak from the beta was fully implemented, and the hitbox isn't, but the camera fully works... except for one thing. In the update log, there was a note for the aiming being fixed for actions such as swimming or gliding with elytra so the player aims at what they expect to, however I found that this aiming fix does not apply to the new sneak height, still being slightly above the crosshairs.
steps to reproduce:
1. Update to 1.19.70
2. Sneak
3. aim at any given block, near the top

expected results:
the selected block is where the crosshair visually is when sneaking

observed results:
the block selected is based on an area slightly above the crosshair when sneaking