Yep. Transactions in subsequent blocks may be reordered or not included at all in the new chain forked from before the incident. Temporarily diverging forks are

Yep. Transactions in subsequent blocks may be reordered or not included at all in the new chain forked from before the incident. Temporarily diverging forks are a property of Bitcoin anyway and must be expected. So your transaction being first confirmed but then dropping out is a possibility without assuming malfeasance. Still it is also possible to revert transactions in Bitcoin if enough people agree. As demonstrated after this hack. The biggest collateral damage is in trust when this is demonstrated in vivo.