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Imagine that there are two collision blocks A and B. These are mined at the same time.
If both miners are neutral, the set of transactions in A is similar to the set of transactions in B.
A miner created a new C block above the A block and the longest chain has occurred.
If the third minor is also neutral, it is likely that some transactions in B and not in A are in C. And some in the parent block of A.
Do transactions in block B return to mempool immediately after being created in block C?
See https://bitcoin.stackexchange.com/a/109920/126793, pay attention to what is commented there: New transactions start as UNCONFIRMED. At BlockConnected, they will transition to CONFIRMED. In case of reorg, at BlockDisconnected, they roll back to UNCONFIRMED.
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