Answers that have search strings or other text containing the underscore character don't display the underscore. Instead, they start italicizing text until they see another underscore. This is going to cause a lot of confusion.
Then "old" posts should have a disclaimer on them. People are going to cut/paste or re-type what they see and the missing underscores are going to cause more problems. Better would be to fix the old posts so that they display correctly.
If you agree, an upvote would be appreciated.