The bug
It looks like when leaving The End using the portal there are two loading screens, one on top of the other.
Depending on the window size of the game this can result in the text of one screen being on top of the text of the other screen.
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Comments 5
From my own test, I could not seem to reproduce this in 1.21. It appears to have been fixed in 1.20.5 Pre-Release 2 alongside the addition of the nether and end portal overlays which show when changing dimensions.
Can you still reproduce this issue in the latest version?
Can confirm for 1.19.3.