Re: "Bluetooth buffering when connecting hearing aid to iPhone 13.
.... constantly buffering so I can’t connect"
You may want to check whether your hearing-aids are lisred as:"Made for iPhone" (Mfi) compatible,
Mfi Hearing Aids listed can take advantage of iPhone's software features for hearing.
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Hearing-aids that are not listed generally need to rely on bluetooth for connection and an app for control
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Whether listed as Mfi, or not:
The hearing-aids may require a firmware update for compatibility with the iPhone in order to connect.
If you use an app with the hearing-aids, check in that app for firmware or app updates.
Else: Check the hearing-aid manual for the firmware info., or check the manufacturer's support website for a possible download. Otherwise, your hearing-specialist may be able to help with updates.
All the best :-)