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Implement/match `LegoNavController::Notify` #5020

Job	Run time
MSVC 4.20	1m 27s
Current MSVC	2m 10s
Current msys2 mingw32	4m 13s
Current msys2 clang32	5m 18s
Download original binaries / fetch	4s
Compare with master	1m 41s
Upload artifacts	0s
	14m 53s

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