How much HAs reduce environmental sounds when streaming is configurable by the way, but only by the audiologist if you don't have your own programmer. I don't like the effect and prefer to just turn down the volume manually.
At least in the US, I could see that being something that the ADA prohibits.
I tracked it down to American Express's login page (auto loads if you leave the site idle) relying on Akamai's anti bot measures polling some web Bluetooth feature, causing Chrome to trigger a BT scan: https://castle.io/research/fingerprint-harvesting-in-the-bot...
Turning off Bluetooth solves it, but that's not a great solution when using a Bluetooth mouse... and it sounds like it might be causing your issue too.
I would suspect that this only happens when you're charging and it is likely the charger or cable not being properly shielded.
Charging only happens while in the cradle, not while worn.
I don't think you know what you are talking about