When one's meal extended past nightfall and ended, may one recite Birkat HaMazon and Havdalah over the same cup?

ShabbatHavdalah

Synopsis

One who continued eating from before nightfall finishes the meal, recites Birkat HaMazon over the cup, and then recites Havdalah over the same cup (if only one is available), or over a second cup if available.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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