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i read code in IsInitialBlockDownload(), located in https://github.com/bitcoin/bitcoin/blob/master/src/validation.cpp.
if (m_chain.Tip()->GetBlockTime() < (GetTime() - nMaxTipAge)) return true;
Let us image if someday somehow all miners are out of work for 1 day, all relay node's block will be 24 hours later than local time. Even they are always online. As a result all node becomes IBD status.
This logic/code above should be considered ... Expected behavior
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