Speech-to-text functionality gone on iOS?

I updated my iPhone and iPad ChatGPT apps today to their latest versions, and then noticed that the speech-to-text button (the microphone above the keyboard) is missing. I used that functionality multiple times per day to transcribe really long train-of-though entries (up to ten minutes) that the app did a really fantastic job of transcribing to text — much better than Apple's native dictation.

Does anyone know if removing this was intentional or not? The functionality is still present on my MacOS app.