repro for 2803

[VenelinMartinov]

tests for #2803

[VenelinMartinov]

This change is part of the following stack:

• move providerbuilder to pkg/pf/internal #2804
  • Add pb.Provider.ToProviderInfo test helper method #2805
    • repro for 2803 #2806 ◀

_{Change managed by git-spice.}