In https://worldbuilding.stackexchange.com/a/31061/885 I see **anti-**gravity where the asterisks are not accepted as bold formatting because the closing one is not followed by whitespace.
In the preview shown while editing the answer, I saw that a U+FEFF character (zero-width no-break space) did the trick. But when completing the edit, it went back to showing asterisks.
Normally I've run into the opposite problem, where unrelated asterisks get read as one spanning formatting directive. But what do we do in this case, where it is not recognizing things as a formatting code?