This is definitely caused by placements. Today I was playing on my sims wend to a date at a restaurant, everything was fine. Then the next day I sent them to the same restaurant using the map and the got the save error. I thought it was a fluke, rebooted, tried again. Save error again. Tried sending them on a date instead of directly traveling. Same issue.
I poked around the internet, eventually found this thread: https://answers.ea.com/t5/Mod-CC-Issues/DO-Error-123-20ece5dd/td-p/7099951/page/6 which mentioned placements. Loaded the restaurant through Manage Worlds, there was a child's drawing on one of the tables. I deleted it, went back to my sims and now they can travel to the restaurant no problem.
Ctrl+F on Better Exceptions listed the following, placemat specific possible issues:
- self: <sims4.tuning.instances.zoneDirector_Restaurant object at 0x00007FF4789B8450>, dining_spot_tests: [ImmutableSlots({'count': 1, 'object_tags': TunableVenueObjectTagsWrapper.factory, 'parent_tags': TunableVenueObjectTagsWrapper.factory, 'required_object_test_tag': <VenueObjectTestTag.Venue_Restaurant_Dining_Slot_Test = 1>}), ImmutableSlots({'count': 2, 'object_tags': TunableVenueObjectTagsWrapper.factory, 'parent_tags': TunableVenueObjectTagsWrapper.factory, 'required_object_test_tag': <VenueObjectTestTag.Venue_Restaurant_Dining_Slot_Test = 1>})], table_ids_dirty: set(), object_manager: object_manager, table_list: [object_Placemat(0x0f95124a1d1f1215), object_tableDining_1x1(0x0dd511bfcdad7443), object_tableDining_1x1(0x0dd511bfcdae74b9), object_tableDining_2x1(0x0dd511bfcdac729d), object_tableDining_1x1(0x0dd511bfcdac7392), object_tableDining_1x1(0x0dd511bfcdad73fe), object_tableDining_1x1(0x0dd511bfcdac733b), object_tableDining_1x1(0x0dd511bfcdac728c), object_tableDining_1x1(0x0dd511bfcdac7283), object_tableDining_1x1(0x0dd511bfcdac7314), object_tableDiningBar_Generic(0x0dd511bfcdac730c), object_tableDining_1x1(0x0dd511bfcdac72bf), object_tableDining_1x1(0x0dd511bfcdad7451), object_tableDiningBar_Generic(0x0dd511bfcdad73d5), object_tableDining_1x1(0x0dd511bfcdac72c6), object_tableDining_2x1(0x0dd511bfcdad7476), object_tableDining_2x1(0x0dd511bfcdab7261), object_tableDining_3x1(0x0dd511bfcdac7363)], child_tags: {<Tag.Func_Stool = 1008>, <Tag.Func_Booth = 26629>, <Tag.Func_DiningChair = 1006>}, test: ImmutableSlots({'count': 2, 'object_tags': TunableVenueObjectTagsWrapper.factory, 'parent_tags': TunableVenueObjectTagsWrapper.factory, 'required_object_test_tag': <VenueObjectTestTag.Venue_Restaurant_Dining_Slot_Test = 1>}), table: object_Placemat:0x0f95124a1d1f1215, table_id_dict: {1122823791624262165: object_Placemat(0x0f95124a1d1f1215), 996722408019555395: object_tableDining_1x1(0x0dd511bfcdad7443), 996722408019621049: object_tableDining_1x1(0x0dd511bfcdae74b9), 996722408019489437: object_tableDining_2x1(0x0dd511bfcdac729d), 996722408019489682: object_tableDining_1x1(0x0dd511bfcdac7392), 996722408019555326: object_tableDining_1x1(0x0dd511bfcdad73fe), 996722408019489595: object_tableDining_1x1(0x0dd511bfcdac733b), 996722408019489420: object_tableDining_1x1(0x0dd511bfcdac728c), 996722408019489411: object_tableDining_1x1(0x0dd511bfcdac7283), 996722408019489556: object_tableDining_1x1(0x0dd511bfcdac7314), 996722408019489548: object_tableDiningBar_Generic(0x0dd511bfcdac730c), 996722408019489471: object_tableDining_1x1(0x0dd511bfcdac72bf), 996722408019555409: object_tableDining_1x1(0x0dd511bfcdad7451), 996722408019555285: object_tableDiningBar_Generic(0x0dd511bfcdad73d5), 996722408019489478: object_tableDining_1x1(0x0dd511bfcdac72c6), 996722408019555446: object_tableDining_2x1(0x0dd511bfcdad7476), 996722408019423841: object_tableDining_2x1(0x0dd511bfcdab7261), 996722408019489635: object_tableDining_3x1(0x0dd511bfcdac7363)}, table_ids_removed: [], dining_spot_dict: {},
