FieldArrayType.add() fails when using FormlyFormBuilder.buildForm()

[Marcus-Karl]

Description
After converting a json schema with an array of objects. If you call FormlyFormBuilder.buildForm you cannot call FieldArrayType.add without getting a console error. Form.valid checks for the form will fail and the form controls will also not render on screen.

Minimal Reproduction
https://stackblitz.com/edit/ngx-formly-ui-material-aydnff

Your Environment

• Angular version: 15.1.2
• Formly version: 6.1.1

Additional context
It looks like FormlyFormBuilder.buildForm() changes the FormArray built in the json schema service to a FormControl, which doesn't have the setControl method.

[aitboudad]

This issue has been fixed and released as part of v6.1.5 release.

Please let us know, in case you are still encountering a similar issue/problem.
Thank you!