Hi Lukas, or anyone else interested,I have pushed the patch to git master. It would be great if you could test it in your environment and confirm everything is OK.
https://salsa.debian.org/openldap-team/openldap/commit/2b2b26f4b52c10ceaa174a935370acdaf12fd952 I can compile packages for stretch or buster if that would help. thanks, Ryan