We thought bitcoin cash and bitcoin both have same addresses just different ledger.
Apparently NOT!
Sending bitcoin cash to a SegWit address will make the coin lost, since bitcoin cash ledger does not support SegWit address.
Since SegWit2x is coming, Bitcoin might have 3 address format and it will confuse bitcoin cash users further and they might lost their coin further, effectively making Bitcoin cash more scarce and less circulating supply.