Disconnecting and reconnecting peers block data bug

[tcanussocys]

When disconnecting a peer, adding some blocks and reconnecting, the blockchain replacement sometimes doesn't replace the block data. It keeps the previous value, but if you change it to what it should be, the hash remains valid (and you don't need to mine it).

Say for instance I have a peer Satoshi and Humberto, which are connected and both have the same blockchain with 4 blocks. If I disconnect Humberto, add a block 'Humberto 1' to it, and add two blocks to Satoshi (say, 'Satoshi 1' and 'Satoshi 2'), when reconnecting, Humberto has the same blockchain as Satoshi, but instead of having a block say 'Satoshi 1' it says 'Humberto 1'. If you change this block's data to 'Satoshi 1', the block will be valid without needing to mine it.

It probably is just a visualization issue, but it does lead to some confusion. Hope this helps