Fixes stack of flags anchoring after placing one down #20590

Job	Run time
Compile Maps	1m 4s
Lint with OpenDream	1m 2s
Find Maps to Test	9s
Run Linters	2m 56s
Windows Build	1m 19s
Unit Tests (chinook) / run_unit_tests	5m 50s
Unit Tests (almayer) / run_unit_tests	6m 3s
Unit Tests (bigredv2) / run_unit_tests	5m 55s
Unit Tests (corsat) / run_unit_tests	5m 52s
Unit Tests (desert_dam) / run_unit_tests	6m 2s
Unit Tests (fiorina_sciannex) / run_unit_tests	5m 54s
Unit Tests (ice_colony_v2) / run_unit_tests	5m 59s
Unit Tests (kutjevo) / run_unit_tests	5m 56s
Unit Tests (lv522_chances_claim) / run_unit_tests	5m 59s
Unit Tests (lv624) / run_unit_tests	5m 58s
Unit Tests (new_varadero) / run_unit_tests	6m 2s
Unit Tests (prison_station_fop) / run_unit_tests	5m 57s
Unit Tests (runtime) / run_unit_tests	5m 47s
Unit Tests (shivas_snowball) / run_unit_tests	5m 48s
Unit Tests (sorokyne_strata) / run_unit_tests	5m 50s
Unit Tests (whiskey_outpost_v2) / run_unit_tests	6m 0s
Alternate Tests (515, 1610, lv624) / run_unit_tests	5m 41s
Check Alternate Tests	1s
	1h 47m 4s

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