Thanks for your inquiry. I am afraid we are not fixing any issues or making improvements in old obsolete versions, because of their complex API structure.
Please note we have released Next Generation GroupDocs for Cloud APIs with more enhanced, efficient and improved programming structure. So we will appreciate it if you please try the latest version of GroupDocs.Signature Cloud API.
Please check the documentation along with the following resources for more details about Next Generation GroupDocs.Signature Cloud APIs. Please feel free to contact us for any further assistance.