I made a few of the off-by-one kind of typos with clients and coworkers really early on in my career, and learned to always always proofread before I ended up having a chat with HR for something completely unintentional.

Examples:

Mild kitty indigestion -> Milf kitty indigestion

Is your free/busty time showing correctly now?

Sometimes I'll type something correct, hit send, and it'll autocorrect the correct word to an incorrect word, e.g. "ant mode" to "any more", AFTER I've hit the send button

I think this happens because generally, autocorrect will do its thing after pressing space, or some other type of white space. At the end of a message, we usually press enter, which then serves both as the autocorrect trigger and the send trigger. You could notice that autocorrect has still selected the word (thus indicating its intention to correct), but really, that’s a bit subtle.

I would think that pressing enter should only send if no autocorrect was triggered by it (and sending requires hitting enter a second time), but maybe then you get the even bigger problem of constantly forgetting to actually send.

Or people could use punctuation at the end of messages. But then Gen Z will think you're mad at them.