"Custom Mouse Buttons & Modifiers" won't allow user to specify the "Click Type" (always resets to "Left Mouse Button")

Attempting to configure an action of type "Custom Mouse Buttons & Modifiers" specifying anything other than "Left Mouse Button" results in the dropdown select box instantly resetting to "Left Mouse Button".

Add a new trigger and then for the first action choose "Custom Mouse Buttons & Modifiers". With that action's UI loaded then locate the "Click Type:" dropdown select box which defaults to "Left Mouse Button". Click the select box to see the options. Select "Left Double Click" (indicating the user wants/intends the mouse action to generate a double click event) and note that the value displayed in the dropdown select box instantly reverts to "Left Mouse Button".

As of 2021-07-26 22:03:00.602 EST and using Version 3.571 I am able to reproduce this problem consistently. I have created a GIF of the issue happening attached to this bug report.

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

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Device information:

  • Type of Mac: MacBook Pro 13" 2019
  • macOS version: Big Sur 11.5 (20G71)
  • BetterTouchTool version: 3.571