canonical_name option for error_with_option_name is giving NULL string

The error is "option is ambiguous and matches 'parent_run' and 'parent_hierarchy' " instead it should be "option '-parent' is ambiguous and matches '-parent_run' and '-parent_hierarchy' " Here since -parent is canonical name and it set to NULL string , it is giving the first error message. I have checked the canonical name using get_canonical_name function.
Below is the code snippet.
catch(boost::program_options::error& e){
std::cout<

Start by reproducing the ambiguity error with the shown program_options catch and trace the get_canonical_name function mentioned in the report. Confirm whether the canonical name becomes a NULL string, then verify that the completed behavior includes '-parent' and both matching option names in the error message. The payload names no source file or test path.

Written by the indexing model from the issue text.