Every time there is a clickable image (E.g: Vertex Color Materials | Unreal Engine Documentation) when you click on it, then close it, you cannot scroll the page anymore. It also throws this error 62 times:
tracking.js:6 Uncaught TypeError: Invalid attempt to iterate non-iterable instance.
In order to be iterable, non-array objects must have a [Symbol.iterator]() method.
at u (tracking.js:6)
at Object.__blockIframes (tracking.js:6)
at MutationObserver.observe.childList (tracking.js:6)
Tested in Chrome 88.0.4324.96 and Edge 87.0.664.75.