Drag Actions within VNC works with BetterSnapTool, but not BetterTouchTool.
Mac Mini 2012 & 2014 both w/MacOS 10.15.6 (host running BST/BTT)
Macbook Pro 2012 w/MacOS 10.15.6 (vnc client running)
My workaround solution will be to start using BetterSnapTool again, by default at login, since I am currently not using some of the BetterTouchTool features very often and can just launch that when I'm physically at a Mac as needed. Or until BetterSnapTool is no longer supported (which maybe/hopefully won't be for a while).
I didn't expect a reply so quickly, so thanks for even the acknowledgment.