Doors not opening fully in LAN servers, they split in half and result in the irreversible inability to interact with right-click. Its not related with connection quality as monsters and other players will still move.

I'm seeing this issue as well, on the latest snapshot (currently 19w36a).  New players who join the world for the first time are unable to open the first door they interact with, instead getting a half-door.  Other players do not see the half door.  Right-click functionality appears to break for the new user - at minimum they are unable to interact with chests.  If they reconnect and avoid that first door, all other doors and objects seem to work correctly.  Players can revisit that door and re-experience the problem.  For every right-click that doesn't work, the server emits a message like this:

[20:47:36] [Server thread/WARN]: Mismatch in destroy block pos: ew{x=0, y=0, z=0} ew{x=-110, y=67, z=-195}

This is with an entirely vanilla server.jar and no plugins.

Just searching through Jira for "half door" I also found MC-152865 which might be related.

@@unknown, what you are describing is the spawn protection of servers, see server.properties wiki article.
The bugs you are describing are now tracked as MC-166432 and MC-166437.

Reopened because LAN does not have spawn protection.