I tried to use bless but it fails with:
bless --folder /Volumes/Macintosh\ HD/System/Library/CoreServices/ --file /Volumes/Macintosh\ HD/System/Library/CoreServices/boot.efi --setBoot
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Could not determine partition for /dev/disk4s1
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Could not determine if partitiion needs booter
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Error while updating booter for /dev/disk4s1
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Unknown system type
dschiller
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Could be fixed by reinstall macOS via recovery mode. No data loss. BUt doesnÄt explain why Configurator 2 destroyed the boot sector.
Could not find any solution so far.
https://forums.macrumors.com/threads/install-macos-sequoia-in-utm-a-howto.2428780/