Oracle 19c export utility fails

Hi, we are getting the following error:

ORA-39126: Unerwarteter schwerwiegender Fehler für Worker in KUPW$WORKER.CREATE_OBJECT_ROWS [PACKAGE_BODY]

 ORA-39155: Fehler beim Erweitern von Dumpdateiname "/var/opt/omni/tmp/rcvcat9084.exp"

ORA-48128: Öffnen eines symbolischen Links ist nicht zulässig

Oracle is now sensitive about symlinks, and yes, /var/opt/omni/tmp contains a link and can't be changed.

Is there a Variable for the export utility to place the dump to a different directory?

BR Josef