Bangladesh must keep their feet on the ground. We do not blame the pitch thoroughly, since conditions are improving. Batsmen get the runs smoothly as runs keep coming in. Are they trapped in their own cheap trick? However, spinning friendly wickets are no longer suitable to them. As a result of batting negligence, Bangladesh lose the third T20I, while New Zealand bowls in well manner.
There have been some criticism directed at the pitch.
https://www.espncricinfo.com/story/ban-vs-nz-2021-mirpur-pitches-could-do-bangladesh-t20-world-cup-prep-more-harm-than-good-1276510Less than 45 days out from the T20 World Cup, Bangladesh are walking a tightrope between whipping up a winning feeling and experiencing a slump in their batters' confidence, with the pitches at the Shere Bangla National Stadium in Dhaka at the centre of this conundrum. The surfaces haven't come together well; they have lacked pace and produced sharp spin and uneven bounce. It's unlikely Bangladesh will play on similar tracks in Oman and the UAE when the T20 World Cup gets underway on October 17.
Preparing tracks that suit the spin bowlers is OK... but in this case the BCB seems to have gone too far. I don't expect the ICC to prepare similar wickets for the T20 World Cup, because that will have an impact on the television revenues. The tracks are likely to be very flat, with totals of 180-200 enough for a win. Now the question is whether Bangladesh can get adjusted to the conditions in UAE and Oman, after playing in spin-friendly tracks for the last few months.