A lot of times when using the Apple Pencil ClickUp doesn't recognize the clicks. I'll have to use the finger instead of the pencil. Tested on latest iPad OS with iPad Pro (10.5 inch) and Apple Pencil version 1.
This seems to be same for the ClickUp App as well as using the website in Safari. I guess it's because the ClickUp App is more or less a web view. Would be great if this could be fixed as it is very annoying.