When typing in an input (textarea, input tag, editable, …) which is itself placed inside of a custom html element, the hotkey is still fired. That's because theisFormField handler checks only the target element, which is this case is the custom element. It should instead use theexplicitOriginalTarget property, since that contains the actual input element.

Here's a minimal reproduction:https://jsfiddle.net/zm7etdh3/