local error during search in container?

[joachimlindenberg]

I am developing on windows but running the code in a docker container on linux (now .NET 8).
connecting to LDAP works fine, but search throws a LocalLdapException, or as I print them to stderr:
Local Error at Novell.Directory.Ldap.LdapSearchResults.Next() at <my code>
the exact same code runs on Windows.
as connection works and other code can access ldap I don´t think it is a network issue (#205) nor TLS issue, but specific to search.
Any idea what to look out for?