Guided Rule does not recognise the Method overloading(with multiple input parameters) implemented in Data Object

Guided Rule does not recognise the Method overloading (multiple input parameters) implemented in Data Object.
When I create a Guided Rule and selected a method (which is overloaded with multiple input parameters), it does not gives any error and the rule created successfully. Now, save it and close it.

Reopen the same Guided Rule, it shows the input parameter differently (even though I have created with multiple input parameters). The $ sign comes in a Bracket and the rest are delimited by a . (DOT).

If I go to the "Source" tab, it shows the different code from the original.

On creation get Number($.inputvalue.details.salary , 0);

On Reopening :
The Function shows as : getNumber("getNumber("$").inputvalue.details.salary", "0")