A free alternative to BTT trackpad gestures is jitouch2 (https://www.jitouch.com). It's not as versatile and no longer maintained, but works well for most use cases even in the latest version of MacOS.
I used to be able to restart BTT and snapping would work again, but that is no longer effective in the latest version. I guess the fact that it even has a "restart" option in its drop-down menu should have been a hint.