See my response to you above... a little unclear if you don't have a hub, or do have an Anker hub, but try moving the Anker hub far away from your Macbook and

See my response to you above... a little unclear if you don't have a hub, or do have an Anker hub, but try moving the Anker hub far away from your Macbook and see if you still have the bluetooth issue. You need a USB cable (depending on what's the hub is you might need a 3.1 Gen2) long enough. For me it was a hardware proximity issue. Powered external devices interfering with the Mac's bluetooth.