i just had a bug for 20.10 merged into this one. note that in my case, this just started happening since upgrading to 20.10, and it happens with multiple different brands of bluetooth adaptor. as well, if use my keyboard to open the bluetooth settings panel in gnome, then everything immediately reconnects as soon as the settings load, so it doesn't appear to be anything to do with hardware, but instead a bug in terms of what gnome services do when the system resumes.
i just had a bug for 20.10 merged into this one. note that in my case, this just started happening since upgrading to 20.10, and it happens with multiple different brands of bluetooth adaptor. as well, if use my keyboard to open the bluetooth settings panel in gnome, then everything immediately reconnects as soon as the settings load, so it doesn't appear to be anything to do with hardware, but instead a bug in terms of what gnome services do when the system resumes.