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Currently I am preparing the text for a paper (together with two coauthors) where we cite help from MO on two occasions. I am doing this using the cite button. It works correctly both in Acrobat and SumatraPDF, i. e. leads to the correct place when clicked from inside pdf. However when I do it in the built in gmail pdf viewer, both in latest builds of Chrome and Firefox, it gives a wrong page, although on MO. The reason is that I don't know why but it shaves off the very last symbol of the url. This happens with both links.

I am on Windows 10. Here is one of the two cases; the second produces identical error.

I want to cite the answer https://mathoverflow.net/a/313198. The cite link with the amsrefs option produces

\bib\{313198}{misc}{    
title={Seeking a more symmetric realization of a configuration of 10 planes, 25 lines and 15 points in projective space},    
author={Noam D. Elkies (https://mathoverflow.net/users/14830/noam-d-elkies)},    
note={URL: https://mathoverflow.net/q/313198 (version: 2018-10-19)},    
eprint={https://mathoverflow.net/q/313198},    
organization={MathOverflow}  
}

which I paste as

\bib{MOElkies}{misc}{
label={E},
title={Seeking a more symmetric realization of a configuration of 10 planes, 25 lines and 15 points in projective space},
author={Noam D. Elkies (https://mathoverflow.net/users/14830/noam-d-elkies)},
note={URL: https://mathoverflow.net/q/313198 (version: 2018-10-19)},
eprint={https://mathoverflow.net/q/313198},
organization={MathOverflow}
}

into the tex file between \begin{bibdiv}\begin{biblist}*{labels={shortalphabetic}} and \end{biblist}\end{bibdiv} (along with several other references).

As I said, the url is correct in the Acrobat and SumatraPDF; in the gmail pdf viewer, if I copy the link it is also OK, but if I click on it, I am sent to https://mathoverflow.net/q/31319, which is, understandably, an entirely different answer to an entirely different question.

I am not sure whether to use the tag here, as apparently it is a bug in the gmail pdf viewer, not in the MO system, but I believe still something has to be done about it.

Update

Tried to strip it down to an mwe:

\documentclass{amsart}

\usepackage{amsrefs}

\begin{document}

$\binom nk$

\begin{biblist}
\bib{E}{misc}{
author={Noam D. Elkies (https://mathoverflow.net/users/14830/noam-d-elkies)},
note={URL: https://mathoverflow.net/q/313198 (version: 2018-10-19)}
}
\end{biblist}
\end{document} 

Strangely enough, if I omit that $\binom nk$ or put there anything else, the error does not occur.

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