Yes, but you're not talking about Bitcoin, you're talking about a Bitcoin fork. Bitcoin wasn't designed to let users provoke a fork with the GUI, that's how your Bitcoin fork BU was designed.
So much for Honey Badger, it seems bitcoin might have a serious flaw, if what you are saying is correct.
Much cheaper than a 51% attack. Just spin up a handful of non-conforming nodes and mine an invalid block. Boom! And Bitcoin is done for.
and yet this non event of just a reject occuring and thrown aside in 3 seconds. proves consensus works.
what would actually cause the bilateral split. is what core done next in this non-event. by over using the banscore tweaks to drop connections to NODES even when the nodes were not the cause.
leaving the connection open would have done no harm because core nodes already rejected the block.. and the block drama was over in 3 seconds.
but by dropping the connections aswell, they then no longer play by consensus rules and the two non-communicating nodes could end up following different data. because they no longer allow communication with each other to reject/accept the same data.