[fatboy]

With both French and English enabled, it sometimes randomly "corrects" the English word "the" to the French word "thé" (meaning "tea" in English), despite every other word so far being English and despite the fact it would make no grammatical sense.

Most infuriating of all though is when it lets you think you've got through the gauntlet of perfectly valid words being replaced with nonsensical ones, only for it to swap out the last _two words_ you've typed!

[interpol_p]

I've had that replacement (the -> thé) and have never even enabled or used a French language keyboard on my device. At this point I disable autocomplete and autocorrect completely, on macOS and iOS.