That's not the reason for what is happening in Bangladesh. Bangladesh doesn't care what Pakistan has to say about Bangladesh internal state of affairs. But it is distraction. Their frustration has nothing to do with minimal influence from Pakistan being observer at best, more to do with China getting involved for the investment in Bangladesh thus India being aggressive with its policy can only continue to frustrate Bangladesh even more.
Since Bangladesh cannot dish India out openly, Pakistan has just become 'punching bag' as time pass. It is easier to live in delusion than to face the reality, that this time, just maybe this time, Pakistan is not relevant to what's happening in Bangladesh nowadays.
Because it is easy to live in delusion world? The price of reality is too much, that this time, just maybe this time, Pakistan is no longer relevant to Bangladesh. They won't accept the truth because their commemoration about Bangladesh is based on Pakistan. If you take that way, then they will have no choice, but to deal with reality. The reality is also the reason why Bangladesh is yet to have independence, right now it's just a nation based on servitude of Indian policy.