I'm also seeing the warning message

You must update Meltano to get new plugins updates.

in several places since the latest update to 1.6.0 - even on a fresh docker image rebuilt on the latest version. Is this expected?

Yes. This is expected. It’s going to be removed once you update to the next version

OK this is our fault;

You must update Meltano to get new plugins updates.

We have updated the version of

discovery.yml

after we released the last version, so the current Meltano release complains cause it is seeing a newer version in there