To recreate the bug, simply but a splash of lingering potion in the output slot of the brewing stand. You can still see the gray potion icon in the background. In case there is a regular potion in the slot the icon is not that visible, but a small bit still is.
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We're resolving and linking this ticket forward as a duplicate of MC-265033, as that ticket contains more detailed information and/or has already been triaged by Mojang.
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