Middle click action not consitently working unless 'Show Live View' open

Describe the bug
I have setup three middle click options under Global for my Magic Mouse:
1 Finger Tap Above Apple - Middle Click
1 Finger Tap Middle - Middle Click
1 Finger Middle Click - Middle Click

Using Firefox middle click doesn't always work unless I have 'Show Live View' open in BTT. Problem occurs even after multiple system restarts.

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):
I am using a Magic Mouse with BTT 2.697

If applicable, add screenshots to help explain your problem. (You can just paste or drag them here)

Device information:

  • Type of Mac: iMac (Retina 4k, 21.5-inch, Late 2015)
  • macOS version: 10.14.2
  • BetterTouchTool version: 2.697

Additional information (e.g. StackTraces, related issues, screenshots, workarounds, etc.):

Note: Before bug reporting, please make sure you have the latest version of BetterTouchTool and that you have already tried to restart your system :-). If you encounter a crash, please attach a crash log from the macOS Console.app from the "User Diagnostic Reports" section.