Breaking right half of a full double chest results in loosing items in left half

when i go to move my things to another part of my house, i will break the right half of a full/almost full double chest. come back to get the rest and the left half i left behind is empty. not sure if this happens on Lan or Local but it does on Realms

EDIT: THIS happens with single chests as well... just tried it with a full chest . only 4 or so items dropped