core: stdcm: fix small bug, missing lookahead at node creation #11977

Job	Run time
build (core-build, core)	14s
build (editoast, editoast-test)	26s
check_commits	7s
check_integration_tests	1m 22s
build (gateway-test, gateway-standalone, gateway-front)	1m 44s
check_generated_railjson_sync	22s
build (front-build, front-tests, front-devel, front-nginx)	27s
build (osrdyne, osrdyne-test)	23s
check_osrd_schema	41s
check_railjson_generator	1m 54s
Check final newline	7s
check_infra_schema_sync	20s
check_toml	8s
check_reuse_compliance	9s
check_core	4m 8s
check_editoast_tests	4m 14s
check_front_rtk_sync	1m 44s
check_editoast_lints	5m 4s
check_editoast_openapi	1m 17s
check_gateway	2m 4s
check_front	2m 53s
check_osrdyne	2m 35s
integration_tests	7m 55s
	40m 18s

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