BTT Custom snap area resizing incorrectly

Describe the bug
When dragging the window to one particular snap area, the window will snap in place but the window borders will be outside of the snap area. This is consistent across apps and I have to manually resize the window (which is difficult, because it keeps trying to autosnap). I have recreated the snap area multiple times, and still the same problem. This issue has persisted around 1-2 months, but I hadn't reached out about it.

Notice how the typing area in Slack is cut off at the bottom. This happens with all programs, but this was the easiest to demonstrate. It will also cut off the scroll bar on the right side of the window in browsers.

Device information:

  • Type of Mac: MacBook Air 2015
  • macOS version: High Sierra 10.13.6
  • BetterTouchTool version: 2.660