Kristopher L. answered 07/02/22
Experienced environmental geology, geochemistry and botany tutor
While it is not impossible (nature does not need to fit boxes we make),The mint family (Labiatae or Lamiaceae) is a large group of dicotyledonous plants. What this means is that there are specific attributes that apply only to this class of plants. One specific attribute is the pairing of cotyledon (hence the “Di”, meaning two) this also means that for the most part, flowering mint will come in the multiples of 4 or 5 petals, (Not specific to leaves). Monocots will come in multiples of 3, but their leaves are vastly different then dicots, (usually with long parallel narrow leaves and fibrous root systems).
My best guess, the mint you are looking at will get another leaf pack if given enough time/care.