I also filed a bug against the kernel, https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=896976
- Bug#896849: bluez: plugable bluetooth mouse not detected... Joshua Pritikin
- Bug#896849: kernel regression? Joshua N Pritikin
- Bug#896849: kernel regression? Joshua N Pritikin
- Bug#896849: works on ubuntu bionic Joshua N Pritikin
- Bug#896849: xref Joshua N Pritikin
