Upon turning on fullscreen (Options > Video Settings > Fullscreen: ON) and turning fullscreen back off, the maximize option became grayed out. In order to maximize the window I had to close Minecraft and re-open it.
Extra info that might matter: Minecraft was maximized when I turned on full screen.
I have reproduced this two times in a row, so repro shouldn't be too difficult.
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However, this issue has been closed as a Duplicate of MC-68754.
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