This is a clone of MC-111516. It is now indeed much harder to run into but its not fixed completely and you can still run into it in survival, without abusing commands.

Steps to Reproduce

Method 1: Using boat and blue ice

• Create a superflat world covered in blue ice
• Press F5 twice to enter front facing third person mode
• Angle your camera towards the sky (press it into the ground)
  boat.mp4

Method 2: While falling

• Press F5 twice to enter front facing third person mode
• Run this command /execute in minecraft:overworld run tp @s ~ ~1000 ~ 0 45
• While falling, hold W and sprint
  falling.mp4

Method 3: Using elytra and riptide

• (On a regular superflat world) give yourself an eltra and riptide 3 trident
• Make it rain
• Go into third person
• Fly up into the sky at about a 45 degree angle
• Once you hit the snow layer start aiming down at about a 45 degree angle
  elytra(1).mp4

Method 4: Using experimental minecarts

• Build a long looped track
• Set minecartMaxSpeed to 100 or more
• Ride the loop
• Go into third person
  minecart.mp4

Observed Results

• In all 4 cases you will observe your player model flickering

Expected Results

• The player model wouldn't flicker