The validation setting sticking issue should be corrected in the next update that is scheduled to release later this week, or early next.
Spry validation cannot be used for an HTML Editor field.
to add validation for HTML Editor, you need to edit the Server Validations behavior that is added to the page.
Open the server behaviors panel, and double click the Server Validations server behavior.
Select Required, not blank for the validation type, for the server variable, click the lightning bolt icon, and select the HTML Editor form element.
then click the plus button to add the validation to the list.
