I have 7 trackpad gestures, 2 keyboard gestures, and the Doubleclick Main Menubar gesture, all working just fine. I've never tried using the four-finger pinch gesture before because it's been the system default one for bringing out Launchpad. Now that Launchpad might be going away in macOS Tahoe, I started testing if I could use that gesture for something else.
I've been testing it by remapping the Pinch With Thumb and 3 Fingers trackpad gesture to the action Send Keyboard Shortcut: ⌘N and testing it in a new TextEdit document, where that keyboard shortcut creates a new TextEdit document in a new tab, but doing the gesture there does nothing. The Recently Used sidebar section in BTT doesn't show that gesture being triggered either. But the fact that it's working for you, makes me think I should try to completely remove BTT and reinstall. I also just upgraded to BTT 5.468 and that didn't fix it.