For B2X, you should wait a day or two to see what's happening before making a transaction.
Do
not transact B2X unless you want to lose your Bitcoin. There is
no viable replay protection.
^^ This. There is no replay protection in 2x and people should be extra careful. If you want to do it anyway, make sure to move original bitcoin (original blockchain) to the new address before spending 2x from the same old address on the new forked chain.