When capturing the {} expression won't work with multiple monitors

Describe the bug
When capturing the {} expression won't work with multiple monitors. I set the filename of captures to "Screenshot_{datetime}". However, the files are named "1_Screenshot_2018-07-28 17.02.35" and "0_Screenshot_{datetime}". The {datetime} expression does not work on the first monitor.

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

Screenshots
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Device information:

  • Type of Mac: MacBook Pro 2017
  • macOS version: 10.13.6
  • BetterTouchTool version: 2.536(871)

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.