Experiencing this as well, Java edition 1.16-pre5.
This happen when moving onto either farmland or road blocks (both of which are 15/16 tall) and any adjacent block is open space. It does not appear to happen if the farmland or road block is entirely surrounded by full-height blocks or by other blocks that are 15/16 tall.
MC-139543
We've seen the same thing here. The second attachment (20.16.41) is ours.
In our case, the clients were Windows and the server was Linux; server JVM is Oracle HotSpot, v1.8.0 u40.
In our case, the server crashed again after being restarted, as soon as a player joined the server, with essentially the same crash.
Experiencing this as well, Java edition 1.16-pre5.
This happen when moving onto either farmland or road blocks (both of which are 15/16 tall) and any adjacent block is open space. It does not appear to happen if the farmland or road block is entirely surrounded by full-height blocks or by other blocks that are 15/16 tall.