Bangladesh captain Najmul Hossain Shanto said the result was "very disappointing" after pacer Shoriful Islam's early fireworks.
"If we'd taken a third wicket, it could have been a different ball game," said Shanto, before singling out the expensive spin bowling of Mehedi Hasan Miraz and Afif Hossain as a weak point.
"I think our fast bowlers bowled really well but our spinners need to learn quickly before the next match."