oneOf value is not selected when the model contains saved object

[sebdeleze]

Describe the issue
When a record is saved with the second option of the oneOf select box, the editor does not select the value when editing the record.

To Reproduce

1. Go to an editor containing a oneOf field.
2. Save a record with the second option of the oneOf.
3. Re-open the editor
4. The second option is not selected.

Expected behavior
The second option should be selected and the right object displayed in the form.

Additional context
Error seen in document editor on SONAR. Tried to reproduce with the editor tester, but an initial value for the model cannot be set.

[sebdeleze]

It was a misconfiguration in JSON schema, thanks to @jma!