No alert was given for 2NT.
South receibes ♥Q lead which holds. Another heart comes which is ruffed. Now south assumed 2NT showed the minors and though there were very bad splits ahead. East is marked with singleton at most in spades so south begun to draw trumps from hand with ♠A+♠Q
This resulted on +620 which was a bottom for NS.
EW are a first time partnership. East thinks they had agreed on 2NT 2 places to play, but West thinks it was minors,