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> All notifications of mutations that have already been detected, but not yet reported to the observer, are discarded. To hold on to and handle the detected but unreported mutations, use the takeRecords() method. > -- ([Mozilla docs for disconnect]( https://developer.mozilla.org/en-US/docs/Web/API/MutationObserver/disconnect)) Fizz external runtime needs to process mutation records (representing potential Fizz instructions) before calling `disconnect()`. We currently do not do this (and might drop some instructions).