When blocked by someone, it shows up in the Main Menu room list regardless of instance creator or not
Salbug
Even if you aren't the instance creator, users that have you blocked still show up, broken looking as well.
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Sayamame
It may be the same cause as this Canny.
Salbug
Similar bug yes, but in this case, this shouldn't pop up for you
unless
you're the instance creator / world author