Seriously thaw ? What thaw ?
A thaw is when two countries with long standing issues, cooperate to resolve the issues amicably.
What possible grievances does Pakistan have with Bangladesh, that needs solving before they can have better diplomatic relations with us ?
Inability and/or unwillingness to deal with Hasina is a diplomatic failure on their part, there's nothing that can be done about it unless they want to. Hasina maybe be a rock but she's no fool either, if the right moves are made, she will reciprocate.
Anyhow, realistically speaking the two countries don't really have much to gain from each other anyway.
Both countries are moving along just fine with the current bare minimum of diplomatic relations, I don't see why it shouldn't stay the way it is.
Right now amid a pandemic isn't the right time for these things anyway. The ultra nationalist lot in Dhaka will protest, if there are any moves on account of better relations with Pakistan.
And the ultra nationalist Pakistanis, on here and elsewhere, will be just as sore everytime they hear anything about Bangladesh and/or Hasina.
So don't go poking people in the eye, keep it the way it is; keep the status quo.
For now.