Can't mock /api/inventory/v1/hosts

[jelly]

I'm trying to develop against a mocked inventory host as I rather not manually register a machine in the staging environment.

So I changed customProxy's context to /api/inventory/v1/groups but this seems to generate an error in the web application. The mock server logs have:

[14:16:33] › [HTTP SERVER] get /hosts ℹ  info      Request received
[14:16:33] ›     [NEGOTIATOR] ℹ  info      Request contains an accept header: application/json, text/plain, */*
[14:16:33] ›     [VALIDATOR] ✔  success   The request passed the validation rules. Looking for the best response
[14:16:33] ›     [NEGOTIATOR] ✔  success   Found a compatible content for application/json, text/plain, */*
[14:16:34] ›     [NEGOTIATOR] ✔  success   Responding with the requested status code 200
[14:16:34] ›     [VALIDATOR] ✖  error     Violation: response.body.results.0.facts.0 must have required property 'facts'
[14:16:34] ›     [VALIDATOR] ✖  error     Violation: response.body.results.0.facts.1 must have required property 'facts'
[14:16:34] ›     [VALIDATOR] ✖  error     Violation: response.body.results.0.facts.2 must have required property 'facts'