Sametime V12 MongoDB LDAP issue when using webusers

When you move from a Sametime version running on Domino to the Sametime V12 version, running on Docker......there could be a problem when you have webusers running in your Sametime environment. You always have to run the Sametime Name Change utility to move away from Domino (LDAP) syntax ( CN=Remco/O=ORG to CN=Remco,O=ORG) https://help.hcltechsw.com/sametime/11.6/admin/changing__names_in_contact_and_privacy_lists.html There is a problem when you have used Sametime 11.6, which already used MongoDB for chatlogging, and used WEBUSERS (and not registered users). Webusers are saved flat in MongoDB and do not contain the CN=…/O=… syntax. When you move to Sametime V12 and converted the users to LDAP and imported vpuserinfo to MongoDB, you see a loss in Contacts and Archive. Your account is no longer connected to your old chats and doesn’t contain any contacts. Why?
This is a companion discussion topic for the original entry at https://www.angioni.nl/2023/01/29/sametime-v12-mongodb-ldap-converter-issue-when-using-webusers/