Non Positive definite feature in HHL implementation.

[dynamic-queries]

I had significant errors trying to solve a 1D Poisson system Tridiagonal([1,-2,1]) with the implementation in the examples.

While I realize that this is not the scope of the implementation, would it be in the general interest if I could work on a more general implementation that would include other cases as well?

I would be grateful for some guidance in this matter.