Airpod pro 2 produces hollow room sound when used as hearing aid

I've had a pair of AirPod Pro 2 for a couple of weeks. Room sounds with the hearing aid function are hollow sounding. This includes voices, random noises, TV, etc.

I've run the hearing tests and modified the results with my audiologist's results. I've tweaked the various settings and always get a hollow sound. I used to be a telecom development engineer. My wild guess is the processing in each ear piece has slightly different timing or there's no way around the microphone placement limitations.

The AirPods are using the latest firmware 7B21 and my iPhone is running ios 18.2. Are hollow sounds a limitation of the AirPods or hearing aids in general? Should I try a different pair of AirPods?

Music streaming from my PC through Bluetooth works well.

Thanks, Steve