2560x1377 (un-fullscreened)
[media]2560x1440 (fullscreened)
[media]This only occurs for this particular box strangely enough.
This occurs with and without Optifine.
This also only occurs at 1440p fullscreen, not 1080p fullscreen.
GUI scale needs to be set to 3 with 3440x1440 and 2560x1440 resolution. Bug occurs in world selection list.
Cannot reproduce in 1.20.1 with 1440p monitor on GUI scale of 3:
[media]