When you hover over a world to play, or a resource pack to select, all of them get highlighted. This doesn't affect the game, its just a bad cosmetic glitch.
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We're tracking this issue in MC-5130, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Can y'all notice this? Like I literally can't play minecraft with this happening