GUI issue when modifying custom rule and able to delete the GUI field

Looks like you have some issue with the GUI when modifying the rule and able to delete the field in the GUI

when you try to modify custom rule here example:

and use (backspace) key to delete the facebook.com you end with this:

and then when you pred DELETE key you will end with this empty column:

and then after that press BACKSPACE key the field disappear:

and it became free text