ghosts can no longer duplicate themselves in the mob subsystem list tracking them #18885

Job	Run time
Run Linters	3m 3s
Compile Maps	44s
Windows Build	2m 42s
Integration Tests (BASIC_TESTS) / run_integration_tests	3m 37s
Integration Tests (CREATE_AND_DESTROY_TEST) / run_integration_tests	58m 17s
Integration Tests (PLANET_GEN_TEST) / run_integration_tests	4m 57s
Integration Tests (RUIN_PLACEMENT_TEST) / run_integration_tests	4m 38s
Integration Tests (SHIP_PLACEMENT_TEST) / run_integration_tests	9m 51s
	1h 27m 49s

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