[1.21.4] Player flickers/turns invisible when flying

[Lolothepro]

Description of Issue

Player flickers/turns invisible when flying
Note: MC-111516 is fixed

Steps to Reproduce

Obtain elytra and some fireworks.
/give @s minecraft:elytra
/give @s minecraft:firework_rocket{Fireworks:{Flight:3}} 64
Use the fireworks to fly at a high speed.
Switch into third person and take note as to whether or not the player flickers and turns invisible when flying at high speeds.

OptiFine Version

J3_pre3

Installation Method

Prism

Video

2024-12-07.20-28-00_compressed_compressed_compressed_compressed_compressed.mp4

[GeForceLegend]

Not sure if this is the same bug: I noticed player model in 3rd person view will disappear for 1 frame when moving across render chunk (16x16x16) edges. Some chunks might be special as player model won't disappear when moving into it, but still same as other chunks when moving out.

You can try lowering the framerate limit and see if the flickering becomes more visiable.