ghosts can no longer duplicate themselves in the mob subsystem list tracking them #18750

Job	Run time
Compile Maps	43s
Compile Maps	44s
Run Linters	2m 50s
Run Linters	2m 43s
Windows Build	2m 45s
Windows Build	2m 18s
Integration Tests (PLANET_GEN_TEST) / run_integration_tests	4m 56s
Integration Tests (PLANET_GEN_TEST) / run_integration_tests	4m 54s
Integration Tests (BASIC_TESTS) / run_integration_tests	3m 15s
Integration Tests (BASIC_TESTS) / run_integration_tests	3m 23s
Integration Tests (CREATE_AND_DESTROY_TEST) / run_integration_tests	36m 37s
Integration Tests (CREATE_AND_DESTROY_TEST) / run_integration_tests	53m 26s
Integration Tests (RUIN_PLACEMENT_TEST) / run_integration_tests	4m 7s
Integration Tests (RUIN_PLACEMENT_TEST) / run_integration_tests	4m 12s
Integration Tests (SHIP_PLACEMENT_TEST) / run_integration_tests	9m 53s
Integration Tests (SHIP_PLACEMENT_TEST) / run_integration_tests	10m 46s
	2h 27m 32s

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