mesh.point(vertex) returns different points for same vertex

[citystrawman]

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Issue Details

I am debugging my code and I found that mesh.point(vertex) returns different points for same vertex.
I printed out the infomation in my code as follows.
When code runs at the first part, the halfedge h151067 has its source vertex's coordinate as follows:

Then, when the code runs at second part, the halfedge h151067 has its source vertex's coordinate got changed:

between the two parts, what I have done only is to collapse the halfedge that is previous to h , in the documentation it is said that when collapse an edge, the edge's source will be removed and the target will be retained, so that means h's source vertex should not be changed.

I am not sure why this wired situation happens.

Source Code

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[afabri]

Can you please provide the lines of code before and after the collapse.

[citystrawman]

Can you please provide the lines of code before and after the collapse.

I have already solved this problem. Thank you!