Camera briefly pauses at the surface when sinking in any liquid

Steps to reproduce:

1. Find or create a pool of water that's at least 2 blocks deep;
2. Walk into it and watch the camera while you're sinking.

Expected results:
The camera descends with you properly.

Observed results:
The camera pauses at the water surface for a bit and then continues descending after you're already fully submerged.

Notes: This occurs with lava as well, but the fire overlay makes it difficult to reproduce. As of 1.20.40.21 Preview, this issue also causes a mismatch between the player's vision and the newly introduced sound you hear when getting submerged.