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DeclareMathOperator defined within begingroup-endgroup leaks outside

Created by: matroid-de

Dear all,

\begingroup-\endgroup does not work as I expected according to the documentation.

This is a minimal example:

<script type="text/javascript" async src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.2/MathJax.js?config=TeX-MML-AM_CHTML">
</script>
...
<body>
\[
  \require{begingroup}\begingroup
  \DeclareMathOperator{\lcm}{LCM}
\]
As declared:     \(\lcm\)
\(\endgroup\)
still declared: \(\lcm\)

Expected result for the second \lcm was \lcm, as \lcm must not be registered outside begingroup-endgroup. Instead I'm getting LCM twice.

Remark: \newcommand and \let are working as I expected. The possible issue is with \DeclareMathOperator only.

I'd appreciate If someone would check if this is an issue or if I had understood something wrong in the documentation.

Thank you in advance Martin Wohlgemuth