The corresponding options have been deprecated in AK 2.0 and removed in 3.0 (see KIP-174 and KIP-738), so they don't take any effect any longer. Relevant references in the following files (same for 1.8):
connect/1.9/README.md connect-base/1.9/README.md connect-base/1.9/docker-entrypoint.sh
DBZ-4617 Deprecate internal key/value converter options