consensus – How do bitcoin nodes rollback state when the next POW chain is launched

For example the present chain consensus has a complete POW of X… that is agreed upon by all 10k+ BTC nodes.

A brand new “magic” node joins and it has mined a sequence (privately) with complete POW = 2*X. The brand new nodes chain is on the order of lots of of hundreds of blocks as is the present consensus chain…however they’re completely non-overlapping, how would the “magic nodes” new increased POW chain propagate via the community (or wouldn’t it?)

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