If an item travels on ice by being pushed by water and then touches ice without water it stops in place. This bug completely disables so many farms that I and thousands of others have spent time building.
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^^^ Also, on a sidenote, the collision box bug is fixed in the 1.16.20 betas

Thank you for your report!
We're actually already tracking this issue at MCPE-79556, so I will resolve and link this ticket as a duplicate.
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It is the pressure plate, they have collision boxes in 1.16. Try replacing them with signs.