If you enter an end portal in the end for the first time while in F1 mode, the Minecraft: Java Edition logo at the start of the credits will render as translucent and flash occasionally.

To reproduce

1. Create a new world

2. /execute in minecraft:the_end run teleport @s 0 100 0

3. Press F1

4. /setblock ~ ~ ~ minecraft:end_portal

The logo should appear similar to this: