I use Typefinity on an iPhone 13 Pro. I also have voice control turned off. When I have the Typefinity keyboard selected and use dictation, I have an issue with duplication of the spoken text. It happens a third to half of the time when I dictate. It appears to be a buffer issue, as duplication most often happens if I dictate and then type while the microphone is active, or allow the microphone function to time out. Duplication also can happen if I dictate a text message and hit send while the microphone is active. If I type while the microphone is active and get duplication, the added text appears where the cursor was when I began typing, and it is a duplicate of the captured speech. When I have tried typing with the microphone active in the native keyboard I have not had a duplication issue.