In this question:
My answer started out:
Either is fine.
Scope out the edit history.
That was eaten (present in editing and edit preview, gone when I saved the answer/edit) at least three times before I put in the verbiage that someone else edited out along with the actual phrase, which, since that phrase was the meat of the answer was not OK; I understand the desire to "Clean things up" but cleaning them up by making the answer completely about peripheral concerns is a bad way to clean them up.
After having it eaten a fourth and fifth time, I found that bolding it made it stay. But it's definitely odd behavior - no funky control characters or anything else that should make the editor think I was issuing computer commands.