Here's the screenshot of my experience with italic text over Stack Overflow.
Basically it just wraps the word into asterisks and leaves it like this. Here on Meta I do not observe this bug.
No, so they are at least consistent.
I agree it's not exactly what I would expect to happen.
provides a similar but .. more logical .. result as we disable intra-word emphasis, so perhaps the regex just treats
*_ as part of the same character group.
This is fixed in the next build.