The Highlight.js engine that SO uses now simply doesn't support syntax-highlighting for assembly language.
Mind you, neither did the old Google Prettify that used to be used here on Stack Overflow prior to the switchover to highlight.js at the end of September 2020. I had submitted a pull request many years ago, back in 2017, to Google Prettify that added support for x86 assembly code, but it never got merged. This lack of maintenance on Prettify was a big reason why Stack Exchange felt compelled to switch to highlight.js.
Anyway, since highlight.js doesn't support it, it doesn't matter what "hint" string you put after the code fence. As has been mentioned in the comments by Nat Riddle, apparently highlight.js's "automatic" detection is interpreting it as Perl code. In my experience, highlight.js's "automatic" detection is hilariously wrong and should generally just be suppressed:
```none
should do the trick. Better than wrong highlighting, at least.
grmr_bash
to find the list).~~~none
.