[Avodah] D'zabin or Diz'van?

[Simon Montagu]

My family always sang "D'zabin abba bitrei zuzei, chad gadya-a-a-a,
chad gadya", but several haggadot today print it as "Diz'van abba".

Grammaticaly, "diz'van" is probably more correct, assuming that abba
bought the kid rather than selling it, and one of my haggadot brings a
text from a 13th-14th century manuscript (not part of a haggada) which
spells it that way. My question is, does anybody here have a masora to
pronounce it "diz'van", or is it a modern correction?