All your ouptuts are ok :scratch and then it is only blkid command which has an amazing behaviour on your nas.
@fvdw
maybe if you compile the binary strace for jaker we may get some additional information to understand that.
I go to post you a patched format script where I disabled the final check on the fs (I can not use the busybox applet instead as it doesn't return fs type)
This will allow you to update the nas database after formatting and get vol-A