According to the National Safety Council there are “too few deaths to calculate odds”. (source). So, I’m pretty sure we can call the probability of two extremely-rare events happening independently in succession as near to nothing as makes no odds.
Also, modern combined units (sometimes called CVDRs) are built to withstand multiple impacts, and their storage medium is solid state. It is highly likely that, in the event of this near-impossible scenario, the recorder could be recovered again.