Local Brewery Advancement if you put in and take out empty bottles
If you put an empty bottle in a brewing stand and then take it out again you get the local brewery advancement without creating a potion. It also works with water bottles. The only way to confirm this bug is to test it as photos wouldn't really prove anything.
I don't know if this affects other versions as I have only tested it in 1.13.1 pre 1 so far
2018-08-19, 12:05 PM
2018-08-19, 12:11 PM
2018-08-19, 12:11 PM
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