Issue with marksman emphasis/bold-content ending in digit (within helix-editor, broken pipe) can anyone confirm?

[cobratbq]

I have some weird highlighting quirks that I suspect are caused by Marksman crashing, i.e. helix-editor reports (many repeated) "broken pipe". They seem to occur surrounding a certain basic markdown construct.

I wonder if anyone is able to test/confirm this. (I'm not sure, so hoping to get confirmation before reporting this as a bug.)

This fails to properly highlight, with varying results:

• A1 _A1_
• A1 __A1__

While this is processed correctly:

• A1A _A1A_
• A1A __A1A__

It seems to struggle with the final character of the emphasized content being a digit (or non-alpha).