Google Docs spell-check dies if the word anal appears anywhere in a sentence

Try it out. Create a new document. Start a sentence with some spelling errors. Notice the red underlines. Add the word anal. Notice they disappear. The word anus however is fine.

So far 'anal' and the F-word are the only two words I can find that do this. Even the C-word is fine.

That was a fun hour of my life figuring out why my spellcheck was failing.

Edit: Upon further inspection it gets even crazier. When google docs sees the word that looks like it could be 'anal', followed by the word 'gland', it assumes 'anal' and still kills all spellcheck in the sentence, even if 'anal' is not spelled out.

https://i.imgur.com/KjWcQJm.png

“Don’t put it there.”