While editing a large log cabin area, I found that my friends could not see the Logs in any variation except the default first variation. Setting any cabin wall or log piece to Variation 2 or 3 produces no change to the visiting player, only the host.
Simply have a friend look at a log while you edit it. They should see you do anything with it except for changing the variation.
Logs should sync up appearances between players, or between Host and Client.
My Friend’s View: