"0" before "sqrt" when deleting digits by pressing "C" and the result is "0" for any "sqrt" operation

[ass3oooo]

If you delete the numbers by pressing "C" (not holding), and then pressing the operation "sqrt" - then in this case 0 will appear before √, for example 0√9 = 0. If you erase the previous result by HOLDING "C" and use "sqrt" - result 1√9 = 3