why block minning not interrupted when block found?

why block minning not interrupted when block found?

I am working with bitcion version < ver. 0.13.0 which contains the setgenerate true functionallity. I could see in some situations during minning process that when I find a solution, but the other miner has found it already before (and its already published), I get the message: "ERROR: BitcoinMiner: generated block is stale". My question is: why the minning process on a specific block not interrupted at the moment when a solution found by one of the other miners?

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