View "Assigned" disappeared / deleted

You may need to replicate the view from another vault if it has been deleted. Refer to this support article: Restore Built-In Views After Deleted

Doesn't seem to work, the view is beeing skipped as "The following local element has even more recent changes: View {Local ID:9}":

You may need to do some changes to the view in the other vault like described in the support article so that the view version you replicate is newer than the one in your actual vault.

You may need to do some changes to the view in the other vault like described in the support article so that the view version you replicate is newer than the one in your actual vault.