Content Editor modal-form not closing on first 'x' (close button) click

When clicking the 'x' (close button) on an Content Editor extension while editing a blog post or forum thread we must click the button twice to close the modal-form. As far as I can tell this is only replicable if the 'cancel' button is pushed out of the viewport due to the extension containing multiple form-fields within the modal-form (as though the UX is intending the user to first see the option to cancel).

Is this a known issue or best to submit a formal support ticket?


Version: 10.3.1.7330
OS: Windows 10
Browser: Latest version of Edge/Chrome/Firefox