The player's body disappears in F5 mode when the player is above y = 259 at some vertical viewing angles (pitch). The angle at which the body is still visible varies depending on how high they are, however at y = 521 their body is completely invisible regardless of the angle. The bug is worse in the F5 front view (when F5 is pressed twice).
To Reproduce;

• Enter creative mode and fly to y = 259
• Press F5. You will notice at some vertical viewing angles (pitch) the player is not visible.
• Fly higher. Eventually at y = 521 the player is completely invisible regardless of the pitch.