No, a checksum value was implemented, so we were all on the same fork.
Since witness nodes were not producing properly, there was no conensus for any of the chain forks.
Any transactions that were attempted to be sent, weren't written into any particular chain.
So exchanges and the like, wouldn't have had transfers completed while it was in that state.
So that is the long way of answering "did any transactions get rolled back" (I assume you mean, did double spends occur?) --- no.
"Double spend" is one thing, posting something to the blockchain, seeing that it got posted, and then having it deleted the next day is another. I guess there is no such concept as "unconfirmed transaction" in Steem, a transaction that isn't written to the blockchain in due time is probably lost?
I noticed one of the emergency patches was like "ignore all blocks produced while the blockchain was down", that's part of why I'm asking.