The second part of the puzzle is that the agent needs to stop collecting legacy facts in the first place (https://tickets.puppetlabs.com/browse/PUP-8543) However, many builtin providers still rely on legacy facts, like https://github.com/puppetlabs/puppet/blob/e95386bbcb2b4eefb898fd83ac47eaec3bbeb021/lib/puppet/provider/service/init.rb#L24