I don't know if this will help, but I had a similar issue when converting my buffers to what my player node expected. My customer converter block was wrong, and it was giving too much data in the conversion process creating the same effect you described

Also I am at this point wondering is using an AVAudioEngine to handle the output and input is the correct way to go when using the PTT Framework because of the route changes and potential interruptions that get caused.

Just hit this limitation myself, anyone find any resolution or is there an update on the feedback that was submitted?

Just chiming in that I am seeing this with a combo of Xcode 16.2 and iOS 18.3.2.