span is not sent to APM server

I see SPAN data with NodeJs agent 1.14.5 but 2.6.0 is failing to capture same
JS code stays same only APM agent version is changing

debug output from 1.14.5 version:
```
init span { id: 'c5231c49-ad8d-4c08-8c54-e35704096dc1' }
intercepted call to http.request { id: 'c5231c49-ad8d-4c08-8c54-e35704096dc1' }
request details: { protocol: 'https:',
host: 'iapi.xyz.com',
id: 'c5231c49-ad8d-4c08-8c54-e35704096dc1' }
start span { id: 'c5231c49-ad8d-4c08-8c54-e35704096dc1',
name: 'GET iapi.xyz.com/xyz/xyz/../up',
type: 'ext.http.http' }
intercepted http.ClientRequest response event { id: 'c5231c49-ad8d-4c08-8c54-e35704096dc1' }
setting transaction result { id: 'c5231c49-ad8d-4c08-8c54-e35704096dc1',
result: 'HTTP 2xx' }
setting default transaction name: GET /up { id: 'c5231c49-ad8d-4c08-8c54-e35704096dc1' }
ended span { id: 'c5231c49-ad8d-4c08-8c54-e35704096dc1',
name: 'GET iapi.xyz.com/xyz/xyz/../up',
type: 'ext.http.http',
truncated: true }
adding transaction to queue { id: 'c5231c49-ad8d-4c08-8c54-e35704096dc1' }
setting timer to flush queue: 4860ms
ended transaction { id: 'c5231c49-ad8d-4c08-8c54-e35704096dc1',
type: 'request',
result: 'HTTP 2xx',
name: 'GET /up' }
flushing queue
sending transactions payload
```

debug from 2.6.0 version:
```
intercepted request event call to http.Server.prototype.emit
start trace { trans: '54768b21709fe11d',
parent: undefined,
trace: 'bc3d74b2436610ae1574d7604a0d4c68',
name: null,
type: null }
start span { span: '26737ff7e8c227eb',
parent: '54768b21709fe11d',
trace: 'bc3d74b2436610ae1574d7604a0d4c68',
name: null,
type: 'ext.http.http' }
intercepted call to http.request { id: '54768b21709fe11d' }
request details: { protocol: 'https:',
host: 'iapi.xyz.com',
id: '54768b21709fe11d' }
intercepted http.ClientRequest response event { id: '54768b21709fe11d' }
setting transaction result { trans: '54768b21709fe11d',
parent: undefined,
trace: 'bc3d74b2436610ae1574d7604a0d4c68',
result: 'HTTP 2xx' }
setting default transaction name: GET /up { trans: '54768b21709fe11d',
parent: undefined,
trace: 'bc3d74b2436610ae1574d7604a0d4c68' }
sending transaction { trans: '54768b21709fe11d',
trace: 'bc3d74b2436610ae1574d7604a0d4c68' }
ended transaction { trans: '54768b21709fe11d',
parent: undefined,
trace: 'bc3d74b2436610ae1574d7604a0d4c68',
type: 'request',
result: 'HTTP 2xx',
name: 'GET /up' }
```

I'm happy to share more details just tell me what would help here.