Field order not properly saved in layout blocks editor

The order of the fields in the layout blocks after dragging and dropping a schema is not correctly saved.

Reproduction steps:

• Create a new layout block
• Delete the default title and description widgets
• Drop a schema into the editor
• Reorganize fields
• Save

Result:

• the order of the fields is not saved and some fields (might) disappear.

Details in the video BugLayoutBlock-720.mp4.