i scanned the butterfly successfully and it has a description and everything. But then it vanished.
yeah, you can actually scan the butterflies.
their htibox though is only as big aas a single block, they fly almost the whole time inside walls so its hard to scan. they seem to appear and not appear at random, so I never know when one appears or disappears.
they dont seem to linger long in an area, anyways, going away quickly after being seen.