Right click menu in Safari opens link

Describe the bug
I' not entirely sure if that's a bug or a bad setup on my part. I've experienced the following since some time:
Whenever I right click on a link in Safari (ctrl + click) using the trackpad, and select anything from the menu ("open link in new tab" / "download as..." / ...) the menu closes, the selected action happens (eg the link opens in a new tab) BUT the link also opens in the same tab as if I just left clicked on it.
I thought this was a bug in Safari for quite some time but it turns out, this does not happen when I disable BTT for Safari. I have only set up corner clicks with BTT (Application: Global) and nothing else (global or specific) for Trackpad, Magic Mouse or Normal Mice. Could anything else affect this?

Affected input device (e.g. MacBook Trackpad, Magic Mouse/Trackpad, Touch Bar, etc.):
MacBook Trackpad (haven't tried anything else)

Device information:

  • Type of Mac: MacBook Pro (Retina, 15', Mid 2015)
  • macOS version: 10.14.3
  • BetterTouchTool version: 2.717
  • Safar versioni: 12.0.3