For the record, Lets call it the “Core chain” accepts all of BIP-110 blocks. So when BIP-110 mines a block it is on the “Core chain.”
Which means (not that I have inside knowledge) that mine...
110 rejects blocks that core doesn't. Core will never try to build on a shorter chain tip. As soon as 110 rejects a single block 110 nodes and miners are on a shorter chain tip, core won't follow. They can never become 1 thing again.
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