Additional Actions Persist on Group Delete

Describe the bug
A clear and concise description of what the bug is.

I've noticed an issue that occurs whenever I delete a group with buttons which have attached additional actions. When the group is deleted, the additional actions persist, instead appearing as uncategorized gestures within the touch bar. I've attached a screenshot of the issue below.

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

Screenshots
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Device information:

  • Type of Mac: MacBook Pro 15" 2017
  • macOS version: 10.13.6
  • BetterTouchTool version: 2.536

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.