Now in the main net, when a transaction is packaged, it means that the current node confirms it, and it needs at least 2/3 of the 21 super nodes to confirm. In addition, two rounds of confirmation are required.
Therefore, the difference between the current block height and the irreversible block height, up to a maximum of 336( 2 * (2/3) * 21 * 12 = 336 ).
Why not broadcast confirmation to make a block become irreversible faster?