After lots of testing, I can consistently get it not to work as long as at least one of the letters of the manual block-id is capitalized. In these cases no matter how much editing I do to the file, it isn’t until I change the letter to lowercase that it begins working again. I may be wrong but according to the help it is okay to use letters, numbers, and dashes.
Phew! Finally! This was driving me crazy.
I found a post that verifies the capital letters are the issue. Perhaps it has nothing to do with the mixed symbols. I am kind of stumped. During my testing sometimes it just wouldn’t work. It was kind of inconsistent.