I noticed this years ago on reddit...any post with the word "whistleblower" tried to auto-correct to something else. Even here on .win "whistleblower" isn't recognized as a word.
It's not because it's a compound word either...plenty of compound words with as much widespread use as "whistleblower" are added into the dictionary.
I know this may seem insignificant, but I thought it was something worth mentioning.
That's really interesting!