I pressed Tab and Space to navigate and select “Singleplayer“ on the titlescreen menu, this opened the list of worlds as expected, except all worlds wirh single word names (no spaces) were gone, they simply weren’t listed.
When backing out and selecting this option with the mouse, they were there like they should.
This was replicable, and it appeared to me all worlds with single word names dissapeared, with no other variables. I only tested in 1.21.10
Environment
The title screen menu.
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