How is this sort of block accepted?


It is not accepted. In a block, each transaction needs to be legitimate by itself, however the entire block needs to be legitimate as properly. If something is mistaken in regards to the block, it is merely invalid—there is no such thing as a “partially proper”.

As an example a miner creates a block and broadcasts it to their friends. Every full node peer makes an attempt to validate the block and realizes that the block doesn’t comply with to the principles. They drop the block, don’t ahead it to their friends, don’t add it to their blockchain, and don’t replace their UTXO set. Relying on how the miner relayed the block to them, they in all probability even drop the connection and ban the miner for sending invalid knowledge. No person else sees the invalid block except somebody posts about it on social media to ridicule the miner…

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