When launching the game output, the text inside only fills up half the space vertically (even less if I try to resize the window larger). Unsure of how to recreate this bug, but I originally discovered it while running optifine, however I can confirm it is occurring on my vanilla profiles as well.
Unsure what the version numbers at the top mean. This is happening for me in 1.16.4 and 1.16.5.
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We're tracking this issue in MCL-17432, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Fixed. Please check the Fix Version/s field in that ticket to see in which version this behavior was or will be fixed.
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