GET device not returning connection and lastEvent type

[mmgspr]

Describe the bug
When doing a GET device request using ?fetchAttributes=connection&fetchAttributes=lastEvent as parameters, the response's body doesn't contain the "type" field of both connection and lastEvent.
Requesting them using their own requests (/{scopeId}/deviceconnections/{connectionId} and /{scopeId}/devices/{deviceId}/events/{deviceEventId}) do return you the "type" field.

To Reproduce
Steps to reproduce the behavior:

1. Request a device using /{scopeId}/devices/{deviceId} and adding the parameters ?fetchAttributes=connection&fetchAttributes=lastEvent after the deviceId.
2. Inspect the response's body and find the "connection" and "lastEvent" fields.
3. See error

Expected behavior
The response's body containing all the fields (including the "type").

Screenshots
If applicable, add screenshots to help explain your problem.
GET device's body:

GET connection's body:

GET event's body

Version of Kapua
1.5.2

Type of deployment
[X ] Docker
[ ] Openshift (in its variants)
[ ] Others

Main component affected
[ ] Console (in case of console please report info on which browser you encountered the problem)
[X] REST API
[ ] Message Broker
[ ] - Others