Not listed in the first post issues:
1) Since today when I join multiplayer game as a guest, I see all grass/weeks/mushrooms/sap drops/clay etc. as present even if that resource is harvested and not present for host at that location. Guest will see hit to use tool for harvest but will hit thin air if resource is already harvested. Both guests has this issue, but never host. Guests can harvest resources that are present for host, but guests will not see that resource removed (for example chopping grass will cause guest to see fall grass leaf to split and one will fall and turn into grass planks while second will remain where it was, but cannot be harvested again). Guest is able to walk though "phantom" resources - it will cause physics animation to work (for clover/grass) and may cause some pushing glitches during movement, but "phantom" resource will not block movement through it as real resource do.
Example: those clovers inside building do not exist for host and cannot be harvested by guest, but both guests can see them and walk through