I launched Minecraft 21w05a from MultiMC, then I created a new world, pressed F3, opened chat, typed "/tell " and clicked the close button.
A gray screen appeared, as visible here:
[media]I waited 13 minutes, but nothing happened. Then I killed it.
[https://gist.github.com/kb-1000/c53ea7c1be55d38be42f06e87a1489db|https://gist.github.com/kb-1000/c53ea7c1be55d38be42f06e87a1489db]
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All I did when it turned gray was clicking the close button of the Minecraft window. This seems to be 100% reproducible in my environment, and does not happen randomly, from what I can tell (so it doesn't look like a duplicate of MC-213788 to me).
Actually, there's more to it. It does not happen in a few other worlds with different seeds, only in this one.
Recreating the world does not reproduce it either. I attached the world that reproduces it.
A screen recording: https://youtu.be/-487ga2p-H8
Did you sleep in a bed?