Wrong parameter being passed to print_column_plugin() from custom_function_default_print_column_value function.

In core/custom_function_api.php, the custom_function_default_print_column_value function is calling print_column_plugin function with
print_column_plugin( $t_column_object, $p_issue_row, $p_columns_target );

should be

print_column_plugin( $t_column_object, $p_bug, $p_columns_target );