properties keyword inside oneOf keyword in query causes Fastify to crash

[varuna-aample]

Prerequisites

• [X] I have written a descriptive issue title
• [X] I have searched existing issues to ensure the bug has not already been reported

Fastify version

4.2.1

Plugin version

7.4.1

Node.js version

16.14.0

Operating system

Linux

Operating system version (i.e. 20.04, 11.3, 10)

20.04.3

Description

properties keyword inside oneOf keyword in query causes Fastify to crash

TypeError: Cannot read properties of undefined (reading 'split')\n    
    at resolveLocalRef (/home/ubuntu/bo-user/.yarn/cache/@fastify-swagger-npm-7.4.1-1ef61e1d46-b69fc1990d.zip/node_modules/@fastify/swagger/lib/util/common.js:190:36)\n    
    at /home/ubuntu/bo-user/.yarn/cache/@fastify-swagger-npm-7.4.1-1ef61e1d46-b69fc1990d.zip/node_modules/@fastify/swagger/lib/util/common.js:184:20\n    
    at Array.reduce (<anonymous>)\n    
    at resolveLocalRef (/home/ubuntu/bo-user/.yarn/cache/@fastify-swagger-npm-7.4.1-1ef61e1d46-b69fc1990d.zip/node_modules/@fastify/swagger/lib/util/common.js:183:20)\n    
    at plainJsonObjectToOpenapi3 (/home/ubuntu/bo-user/.yarn/cache/@fastify-swagger-npm-7.4.1-1ef61e1d46-b69fc1990d.zip/node_modules/@fastify/swagger/lib/spec/openapi/utils.js:133:41)\n    
    at resolveCommonParams (/home/ubuntu/bo-user/.yarn/cache/@fastify-swagger-npm-7.4.1-1ef61e1d46-b69fc1990d.zip/node_modules/@fastify/swagger/lib/spec/openapi/utils.js:273:15)\n    
    at prepareOpenapiMethod (/home/ubuntu/bo-user/.yarn/cache/@fastify-swagger-npm-7.4.1-1ef61e1d46-b69fc1990d.zip/node_modules/@fastify/swagger/lib/spec/openapi/utils.js:375:29)\n    
    at Object.swagger (/home/ubuntu/bo-user/.yarn/cache/@fastify-swagger-npm-7.4.1-1ef61e1d46-b69fc1990d.zip/node_modules/@fastify/swagger/lib/spec/openapi/index.js:46:29)\n    
    at /home/ubuntu/bo-user/src/utils/generateDocs.js:63:30\n    
    at processTicksAndRejections (node:internal/process/task_queues:96:5)"},"msg":"Cannot read properties of undefined (reading 'split')"}

Steps to Reproduce

const fastify = require('fastify')()

;(async () => {
  await fastify.register(require('@fastify/swagger'), {
    exposeRoute: true,
    routePrefix: '/docs',
    openapi: {
      info: { title: 'Test OpenAPI', version: '1.0.0' }
    }
  })

  fastify.get('/test-route', {
    schema: {
      query: {
        type: 'object',
        oneOf: [
          {
            properties: {
              bar: { type: 'number' }
            }
          },
          {
            properties: {
              foo: { type: 'string' }
            }
          }
        ]
      },
      response: {
        200: {
          type: 'object',
          properties: {
            result: { type: 'string' }
          }
        }
      }
    }
  }, (req, reply) => ({ result: 'OK' }))

  await fastify.ready()
  fastify.swagger()
})()

Expected Behavior

No error expected

[mcollina]

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