Tables in grouped by properties don't show the method name when there's just one method

[gortazar]

Tables in grouped by properties don't show the method name when there's just one method:

If I select best values, both methods are displayed.

[samuelmartingc]

When a report is generated, if only one method is present, then the attribute values instead of showing value=MethodDescription, show value=InstanceDescription and dont return any method's name.
One solution could be change the generation of report to prevent this.