Several developers, miners, and researchers reported that Bitcoin mining developer name Marathon Digital mined an invalid block 809478.

Anonymous Bitcoin developer 0xB10C said in his post on Twitter that MaraPool was warned about a "transaction order problem". This was later confirmed by Jameson Lopp, co-founder of CasaHODL crypto equity custody solutions.

Invalid Bitcoin block rejected by all node operators. According to BitMEX Research, the reason why the block was invalid was an order placed by mistake.

Marathon Digital, have not yet responded to CoinDesk's request for comment.

What do you understand about this?
As Bitcoin miners create new blocks, they race to solve solutions. Each miner tries to solve these problems to replace a new block, and the first miner to solve it correctly wins Bitcoin (BTC) as rewards combined with the new block.

The Bitcoin network does not accept invalid blocks and requires miners to mine blocks according to certain rules. Blocks that do not comply with these rules will be rejected by the network and will not earn any rewards made. In short, the extraction of an invalid block indicates that the execution of transactions will suffer a great loss.