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Imagine there are two collision blocks A and B. These are mined at the same time. One miner created new block C on top of block A and longest chain happened.

Do transactions of block B go back to mempool immediately after being created block C?

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Imagine 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.

One miner created new block C on top of block A and longest chain happened.

If the third miner is neutral too, it is likely that some transactions in B not in A are in C. And some in A's parent block.

Do transactions of block B go back to mempool immediately after being created block C?

See https://bitcoin.stackexchange.com/a/109920/126793, attention at 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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