Ah thanks - definitely a bug that the SVG is malformed, but we don't currently plan to support arbitrary named HTML entities (so I'd say the "correct result" here would be to display "–" literally. The latest status of that is #2932 in which we added support for all numbered HTML entities (simplified example for – = –: https://codepen.io/alexcjohnson/pen/NMdMbE?editors=1010) but in that PR we noted:

Note that this would make it feasible, performance-wise, to include ALL named html entities, but the full list is over 2000 items, and there are other options (unicode literals, or numbered entities if you want your code/JSON to be pure ASCII) so I suggest we keep it at just the existing set.

The "existing set" is a few entities we've supported for a very long time:

Ah I see!
Well I've helped myself with unicode now 😹. Will switch to numbered HTML entities due to code-readability. Thanks for pointing it out! 👍

Hi - this issue has been sitting for a while, so as part of our effort to tidy up our public repositories I'm going to close it. If it's still a concern, we'd be grateful if you could open a new issue (with a short reproducible example if appropriate) so that we can add it to our stack. Cheers - @gvwilson