I had this same glitch, but with a water bottle instead of a milk bucket. It’s worth noting that it works as intended in Creative mode (giving a signal strength of 7), but in Survival mode it’s broken (signal strength of 2).
I had this same glitch, but with a water bottle instead of a milk bucket. It’s worth noting that it works as intended in Creative mode (giving a signal strength of 7), but in Survival mode it’s broken (signal strength of 2).