BTT Fails to ignore system trackpad when Magic Trackpad is connected

Note: Before bug reporting, please make sure you have tried the latest (alpha) 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.

Describe the bug
BetterTouchTool doesn't ignore input from the system trackpad when a Magic Trackpad is connected, even though the MacBook Trackpad is disabled by the general OS through system preferences.

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):
MacBook Trackpad/Magic Trackpad 2

Screenshots
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Device information:

  • Type of Mac: MacBook Pro (Retina, 15-inch Mid 2015)
  • macOS version: Mojave 10.14.6
  • BetterTouchTool version: (please post the exact version - not just "the latest one") 3.209 (1386)