"icinga2 object list -t Host" misses assign-where host groups

Describe the bug

Starting with an Icinga 2 setup with hosts and these hosts being part of host groups. When querying these hosts via icinga2 object list -t Host, no groups are being listed.

$ icinga2 object list -t Host | grep groups
  * groups = [ ]
  * groups = [ ]
  * groups = [ ]
[ . . . ]

However, this information is available when using the Icinga 2 API.

curl -k -s -S -u "icingadb-web:$ICINGA2_API_PASSWORD" -H 'Accept: application/json' 'https://localhost:5665/v1/objects/hosts?pretty=1' | grep -A 1 'groups": \[$'
                "groups": [
                    "openbsd-servers"
--
                "groups": [
                    "openbsd-servers"
--
                "groups": [
                    "linux-servers"

[ . . . ]

To Reproduce

Create one or multiple Host objects, place these in HostGroups, execute the commands from above.

Expected behavior

I would expect the groups to be part of the icinga2 object list output.

Screenshots

N/A

Your Environment

Include as many relevant details about the environment you experienced the problem in

• Version used (icinga2 --version): r2.14.5-1

Additional context

N/A

Start by comparing icinga2 object list -t Host with the API request shown for /v1/objects/hosts, focusing on how host groups are represented. Trace the object-list entry point and its Host output, then verify that hosts assigned to groups display those groups and that the existing command still works for hosts without groups.