It has been confirmed in the Peerplays Telegram channel that the bitshares sharedrop accounts (which are accounts that are prefixed with "bts-") that are claimed when you import a valid bitshares key to claim share dropped stake should not be used to transfer funds to an exchange.
Doing so could result in having to wait on a support ticket at the exchange, because these accounts do not contain memo keys and are not properly submitting a memo in the transaction, which is usually required when sending any stake to an exchange.
Instead, avoid this headache by transferring share dropped funds to an account registered with the faucet or CLI first.