AI-based English was trained to work with real text and skip non-existent wording, that is usually random combinations of letters typing like words in haste for testing purposes. The AI-based engine ignores such nonsense wording and doesn't provide any suggestions for them even if they are in the middle of the real text. But it works if you try to make a misspelling in a real word.
The default language for our products is 'auto', that applies AI-based proofreading for text once the English language is identify. This means that 'auto' language will not provide suggestions for non-existent words as it will use the AI-based engine under the hood for English texts.
Unlike AI-based engines, the classic spell checking is very “simple” (e.g. American English), it relies on the wordlist. And if the word is not in the dictionary, it will be considered a misspelt word. In that case, such a word would be underlined since the spell check mechanism is built on top of the wordlists. Thus, when you switch to a dictionary-based language, you can see the suggestions for non-existent words.
