Dragging row into a group makes group disappear in the form editor

[vsgoulart]

Describe the Bug

When dragging a form row into a group in the form editor for the first time the group disappear in the definition view (it's still visible in the preview).

This bug doesn't occur if you drag as a single element into the group and them drag the row out and then back again in the group.

Steps to Reproduce

1. Drag an element in the form definition
2. Drag a group in the form definition
3. Drag the first element entire row into the group
4. The group disappears

Expected Behavior

The group should remain visible with the row inside

Additional info

https://github.com/bpmn-io/form-js/assets/1022916/68724538-fe12-428d-bcee-39be6292ee47