People in form not rendering properly after loading from save

**Describe the bug**
When form with a "people" type field is loaded after saving the dropdown is not populated with the correct value instead the following is displayed

**Expected behavior**
After saving a form with a people field the people dropdown should be populated correctly with the saved state.

**Code**
If applicable, add the code that you are using when having the issue.

**Additional context**
Running
```
docker run -p 8080:8080 flowable/flowable-ui:6.6.0
```