ucm can't display any terms under `lib.base.FFI.Ptr` namespace

[lJoublanc]

Describe and demonstrate the bug

It seems I can't display anything under the FFI.Ptr namespace:

> docs Ptr

results in

Encountered exception:
refLookup:tm: unknown reference: ReferenceBuiltin "FFI.Ptr.null"
CallStack (from HasCallStack):
  error, called at src/Unison/Runtime/Machine/Types.hs:82:7 in unison-runtime-0.0.0-6M4oD4lzyXlvcxOVRWT63:Unison.Runtime.Machine.Types

or

> display lib.base.FFI.Ptr.nullbase.FFI.Ptr.null

Encountered exception:
user error (🐞

Error in prepareEvaluation, cache is missing: [ReferenceBuiltin "FFI.Ptr.null"]

This is a Unison bug and you can report it here:

https://github.com/unisonweb/unison/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+E029347+

Bug reference: E029347

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Environment (please complete the following information):

• ucm --version release/1.1.0
• OS/Architecture: ubuntu linux

Additional context
First thought it may have been due to upgrading base, but I've just tried it on an empty project and same problem.

display/docs works fine for other terms, as far as I can see.