I've been using BTT since 2 years ago on my 13' no-touchbar MacBook Pro 2017 and MagicMouse 2. Recently my University bought me a 15' MacBook Pro with TouchBar and another MagicMouse 2.
I've sync'd the settings on the two devices and now in both of them, when BTT is open my mouse can't scroll vertically.
Personal: (13-inch, 2017, Two Thunderbolt 3 ports)
Mojave10.14.6
BTT version: 3.207(1384)
Work: Pro 15-inch, 2019
Mojave 10.14.6
BTT version: 3.207(1384)