Hello Sergey,
>>>>> Sergey Organov <sorganov@gmail.com> writes:

    > Emacs coredumps when GNUS tries to read some kinds of mails.  To
    > reproduce from 'emacs -Q', untar attached file that will create
    > 'gnus-coredump' directory with a single mail file in it, then:

    > $ emacs -Q M-x gnus G D ;; gnus-group-enter-directory <type
    > directory name> RET

    > GNUS then tries to open this directory as group and Emacs
    > crashes. The backtrace and other information follows:

--------- cut ----------

I can open your email satisfactorily in emacs-28.0.50. See screen shot
below: