We're trying to start using stdlib 8.1.0 on PE 2019.8.12 and are getting this error:

2022-09-14T09:23:59.017-05:00 ERROR [qtp521455647-138959] [p.r.core] Internal Server Error: org.jruby.exceptions.LoadError: (LoadError) no such file to load -- puppet_x/stdlib

        at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:974)

any tips on getting stdlib 8.1 working on PE 2019?