Bangladesh's only achievement in Test format in the last 5/6 years is probably the Test series win against Pakistan. Bangladesh has won both the 2-match series. However, in the following series, as usual, we have seen Bangladesh's very poor performance. Especially against India, Bangladesh has lost every Test format match by a big margin.
Since the Bangladesh team beat Pakistan, they could not perform better again and before every series, they made confidence by remembering the back to back two wins against Pakistan but that was not anything too big like the World Cup final match.
Secondly, if they win that series they have to play like this but they are completely doing the opposite work. Already they are suffering the loss against West Indies in the previous match and so far I am not looking for anything good for them. The batting performance of Bangladesh is unusual with big surprises. They have already lost their first two batsmen but what if the remaining batsmen can do something better for the team?