Multiple errors in flaky test create_and_destroy

[github-actions]

Flaky tests were detected in this test run. This means that there was a failure that was cleared when the tests were simply restarted.
Failures:

create_and_destroy: [21:20:31] Runtime in code/datums/shuttles/_shuttle.dm,49: cannot read from list
proc name: preload size (/datum/map_template/shuttle/preload_size)
src: CAS Hafila (/datum/map_template/shuttle/personal_buyable/ferries/people_mover)
call stack:
CAS Hafila (/datum/map_template/shuttle/personal_buyable/ferries/people_mover): preload size("_maps/shuttles/~doppler_shuttl...", 0)
CAS Hafila (/datum/map_template/shuttle/personal_buyable/ferries/people_mover): New(null, null, 0)
CAS Hafila (/datum/map_template/shuttle/personal_buyable/ferries/people_mover): New()
the personal shuttle order con... (/obj/machinery/computer/personal_shuttle_order/station): try and fill shopping list()
the personal shuttle order con... (/obj/machinery/computer/personal_shuttle_order/station): post machine initialize()
the personal shuttle order con... (/obj/machinery/computer/personal_shuttle_order/station): LateInitialize() at code/datums/shuttles/_shuttle.dm:49
create_and_destroy: [21:20:32] Runtime in code/datums/shuttles/_shuttle.dm,49: cannot read from list
proc name: preload size (/datum/map_template/shuttle/preload_size)
src: CAS Hafila (/datum/map_template/shuttle/personal_buyable/ferries/people_mover)
call stack:
CAS Hafila (/datum/map_template/shuttle/personal_buyable/ferries/people_mover): preload size("_maps/shuttles/~doppler_shuttl...", 0)
CAS Hafila (/datum/map_template/shuttle/personal_buyable/ferries/people_mover): New(null, null, 0)
CAS Hafila (/datum/map_template/shuttle/personal_buyable/ferries/people_mover): New()
the personal shuttle order con... (/obj/machinery/computer/personal_shuttle_order/cantina): try and fill shopping list()
the personal shuttle order con... (/obj/machinery/computer/personal_shuttle_order/cantina): post machine initialize()
the personal shuttle order con... (/obj/machinery/computer/personal_shuttle_order/cantina): LateInitialize() at code/datums/shuttles/_shuttle.dm:49