Can't remove blank expression in debugger

i have an expression in the debugger that became a problem. i selected the text and hit the delete key. that clears the text of the expression, but it also makes the expression undeletable. if i click on the expression, the edit and delete buttons are missing.
there is a workaround: click in the expression area, type a new expression, even a nonsense one. that will cause the edit and delete buttons to reappear.

Hello Mikey,

We confirm that it’s a bug when clicking in an empty expression in the debugger, the two buttons disappear.
We will declare it and let you know when it’s fixed.

Best regards.