Restore previous beatmap when leaving scoped mode #30319

Job	Run time
Test (Linux, ubuntu-latest, MultiThreaded)	33m 52s
Test (Windows, windows-latest, SingleThread)	54m 44s
Build only (Android)	11m 56s
Build only (iOS)	6m 4s
Test (Windows, windows-latest, MultiThreaded)	54m 14s
Test (Linux, ubuntu-latest, SingleThread)	28m 58s
Code Quality	23m 33s
	3h 33m 21s

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