That must have been a different bug, check the date: “March 2022”. It would be surprising if the Iodé folks managed to fix a bug which at that time hadn’t appeared yet. 
As for the keyboard autocorrect, it’s mostly hit and miss on my stock-everything FP4. I’m communicating in French and German (and some English from time to time), and it does have problems detecting which language I’m currently using. English is detected very quickly, German and French (in that order) are more hit-and-miss. For them it takes several (3-4) unambiguous words for the keyboard to know what language to suggest from, and even then it sometimes still suggest from another language (just in case?..).