SMB1 for HEOS on Ubuntu Focal

Last weekend I updated my ZFS NAS from Ubuntu 18.04.5 LTS (Bionic Beaver) to Ubuntu 20.04.1 LTS (Focal Fossa). However, after the update, my HEOS speakers refused to play any music. After some tinkering, I was able to resolve this by re-enabling SMB1 or actually NT1 support.