Fixes stack of flags anchoring after placing one down #20587

Job	Run time
Lint with OpenDream	30s
Compile Maps	1m 6s
Windows Build	1m 16s
Run Linters	1m 57s
Find Maps to Test	11s
Unit Tests (almayer) / run_unit_tests	5m 51s
Unit Tests (bigredv2) / run_unit_tests	5m 54s
Unit Tests (corsat) / run_unit_tests	6m 33s
Unit Tests (chinook) / run_unit_tests	5m 47s
Unit Tests (desert_dam) / run_unit_tests	6m 6s
Unit Tests (fiorina_sciannex) / run_unit_tests	27s
Unit Tests (ice_colony_v2) / run_unit_tests	5m 50s
Unit Tests (kutjevo) / run_unit_tests	25s
Unit Tests (lv522_chances_claim) / run_unit_tests	5m 56s
Unit Tests (lv624) / run_unit_tests	6m 2s
Unit Tests (new_varadero) / run_unit_tests	6m 19s
Unit Tests (prison_station_fop) / run_unit_tests	24s
Unit Tests (runtime) / run_unit_tests	5m 44s
Unit Tests (whiskey_outpost_v2) / run_unit_tests	5m 46s
Unit Tests (shivas_snowball) / run_unit_tests	51s
Unit Tests (sorokyne_strata) / run_unit_tests	6m 3s
Alternate Tests (515, 1610, lv624) / run_unit_tests	5m 49s
Check Alternate Tests	1s
	1h 24m 48s

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