What if some transaction is mined into "orphaned block" ？Some node will remove it from mempool because it is in block. But as it is "orphaned block", the transaction is invalidate.
is it possible transaction is lost in bitcoin network?
No, if a block is orphan in one node, it means it has been mined on another node sooner, or it was unacceptable by nodes.
but if there has been a personal transaction from a personal wallet which faced this problem, it can be re-broadcast again from wallet to network to get the confirmation