I'm either too smart or too dumb for this. the miner with a valid block which is not included in the chain is either not a valid block, or a temporary chain split that will be automatically resolved in the next 1-2 blocks. This is be design and there is nothing to discuss here;)
blocks can be "valid" but if they aren't the first valid block you receive, they don't get added to your copy of the blockchain.
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