One finger TipTap

Hi, have you changed the TipTap left/TipTap right?
I always use TipTap one finger to change tab shortcuts in my web browser.
tiptap left : command+option+←
tiptap right : command+option+→

One-finger TipTap is not working
TipTap left/Right with two fingers does work.

Version 3.581
iOS 11.5.2