[multiplayer] Error message after starting a build and on reload

Getting these error messages after loading a multiplayer savegame. Similar issues occured for my girlfriend first. She connected to my world and got the error. New builder behaviour was slow afterwards. Dragging rooms wouldn’t show the room until dragging is finished. During the actual building process only scaffolding was visible at first. Saving and reloading the savegame helped to alleviate that issue but the overall wonkyness of the new builder remained. Happend to me, too, then after I designed my first building (minus the invisible building).
No mods used.

Error message

release-835 (x64)
…hearth/services/client/building/building_service.lua:298: attempt to index local ‘b’ (a nil value)
stack traceback:
[C]: ?
…hearth/services/client/building/building_service.lua:298: in function ‘set_widgets_visible’
…hearth/services/client/building/building_service.lua:212: in function ‘_on_ui_mode_changed’
…hearth/services/client/building/building_service.lua:171: in function <…hearth/services/client/building/building_service.lua:170>

release-835 (x64)
c++ exception: lua runtime error
stack traceback:

release-835 (x64)
stonehearth/components/lease/lease_component.lua:169: attempt to index field ‘_factions’ (a nil value)
stack traceback:
[C]: ?
stonehearth/components/lease/lease_component.lua:169: in function ‘release’
radiant/modules/entities.lua:1180: in function ‘release_lease’
stonehearth/components/mount/mount_component.lua:169: in function ‘dismount’
stonehearth/components/mount/mount_component.lua:270: in function <stonehearth/components/mount/mount_component.lua:268>

release-835 (x64)
No matching overload found, candidates: bool are_connected(lua_State*,Point3 const&,Region3 const&,int) bool are_connected(lua_State*,Point3 const&,Point3 const&,int) bool are_connected(lua_State*,custom [class std::weak_ptr],Region3 const&) bool are_connected(lua_State*,custom [class std::weak_ptr],Point3 const&) bool are_connected(lua_State*,custom [class std::weak_ptr],custom [class std::weak_ptr])
stack traceback:
radiant/modules/commons.lua:53: in function ‘report_traceback’
radiant/modules/commons.lua:64: in function <radiant/modules/commons.lua:58>
[C]: in function ‘are_connected’
…tonehearth/components/building2/building_monitor.lua:196: in function ‘_on_building_progress_slow’
…tonehearth/components/building2/building_monitor.lua:172: in function ‘fn’
radiant/controllers/nonpersistent_timer.lua:56: in function ‘fire’
radiant/controllers/time_tracker_controller.lua:86: in function <radiant/controllers/time_tracker_controller.lua:86>
[C]: in function ‘xpcall’
radiant/modules/commons.lua:73: in function ‘xpcall’
radiant/controllers/time_tracker_controller.lua:86: in function ‘set_now’
radiant/controllers/time_tracker_controller.lua:126: in function ‘increment_now’
radiant/modules/timer.lua:13: in function ‘instance’
radiant/modules/events.lua:291: in function <radiant/modules/events.lua:285>
[C]: in function ‘xpcall’
radiant/modules/commons.lua:73: in function ‘xpcall’
radiant/modules/events.lua:285: in function ‘trigger’
radiant/modules/events.lua:405: in function ‘_trigger_gameloop’
radiant/modules/events.lua:453: in function ‘_update’
radiant/server.lua:66: in function <radiant/server.lua:63>

1525291139958.zip (5.8 MB)