Changes in productGroups for CUSTOM productGroupType are ignored

[mvpett]

We encountered a situation where after adding a new item in customDataGroupItems we did not notice any changes in the environment.
This was not the first run on a clean environment. It was subsequent launch.
The expected behaviour was to find a new customDataGroupItem by bootstrap-task and update the database entry.

Situation looked like this.

1. legal-entities.json file contains similar entry. Product group and customDataGroupItem defined below are present in the database.

"productGroups":[
                      {
                         "name":"PRODUCT GROUP NAME",
                         "description":"DESCRIPTION",
                         "productGroupType":"CUSTOM",
                         "customDataGroupItems":[
                            {
                               "internalId":"some-id"
                            }
                         ]
                      }
]

2. Changes were made to legal-entities.json file - new customDataGroupItem was added.

"productGroups":[
                      {
                         "name":"PRODUCT GROUP NAME",
                         "description":"DESCRIPTION",
                         "productGroupType":"CUSTOM",
                         "customDataGroupItems":[
                            {
                               "internalId":"some-id"
                            },
                            {
                               "internalId":"some-other-id"
                            }
                         ]
                      }
]

3. Environment synced with new configuration - we can see contents of new legal-entities.json file in configMap.
4. After bootstrap-task job is done customDataGroupItem with internalId="some-other-id" is absent in the database.

We expect that it should be present.