Updating to 19.10 hasn't fixed the problem, but I have just replaced my mouse and found the issue is no longer there with the new one. The original was a Microsoft Wireless Mobile Mouse 1000 (045e:0745 Microsoft Corp. Nano Transceiver v1.0 for Bluetooth) and the new one is a Logitech M220 (046d:c534 Logitech, Inc. Unifying Receiver).
Not a fix, but a work around perhaps and extra info for any debugging. I still have the Microsoft one to test any fixes posted here.
Updating to 19.10 hasn't fixed the problem, but I have just replaced my mouse and found the issue is no longer there with the new one. The original was a Microsoft Wireless Mobile Mouse 1000 (045e:0745 Microsoft Corp. Nano Transceiver v1.0 for Bluetooth) and the new one is a Logitech M220 (046d:c534 Logitech, Inc. Unifying Receiver).
Not a fix, but a work around perhaps and extra info for any debugging. I still have the Microsoft one to test any fixes posted here.