I dont know if things have changed, but when a similar thing happened 2 years ago, my voucher reloaded.
Sounds fine, but if you use a voucher and then cancel, you better remember which voucher you used. I had been very good about tracking vouchers and their balances, but if you book 6 months out, you might forget the voucher is still in play so to speak. I now specifically track them up to flying, not till I spent them.