Works fine for me, although I obviously didn't test ALL the functionality
Sanity check failed: > media-sound/musescore-3.4.2 > depend ~arm64 stable profile default/linux/arm64/17.0 (9 total) > >=dev-qt/qtsingleapplication-2.6.1_p20171024[X] > rdepend ~arm64 stable profile default/linux/arm64/17.0 (9 total) > >=dev-qt/qtsingleapplication-2.6.1_p20171024[X]
Sanity check failed: > dev-qt/qtsingleapplication-2.6.1_p20171024 > depend ~arm64 stable profile default/linux/arm64/17.0 (9 total) > dev-qt/qtlockedfile[qt5(+)] > rdepend ~arm64 stable profile default/linux/arm64/17.0 (9 total) > dev-qt/qtlockedfile[qt5(+)]
All sanity-check issues have been resolved
~arm64 added, closing