We have just made a release for Chef Client with some backwards
compatibility fixes that makes migration from Chef Client 11 easier. You
can read more about this release here:
James Scott has also prepared a new page in our docs that lists the
important issues to be considered when migrating from Chef Client 11 to 12.
We will keep this up to date as we discover more issues. You can see this
As usual, if you run into an issue and we will make sure you’re unblocked.