In this new snapshot theres a bug where dirtblocks that are tilled or made into pathways push the players off. This makes it not impossible to get around villages or farms, but it is quite annoying to deal with. Hopefully you guys can fix it before the next pre-release!
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We're already tracking this issue at MC-166386, so I will resolve and link this ticket as a duplicate.
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I'm having this issue too, it's really annoying because now I can't harvest my wheat field without trampling some crops first.