Creating a widget with default as column count does not work

[LoicGoyet]

I am trying to create a layout-widget with thoses following parameters :

• hasContainer as true
• each breakpoint as 'default' for the layout select

When I try to submit the new form, no errors pops in front, but the request this :

{
    "success": false,
    "message": "data.layoutMdLaptop : This value cannot be empty (translated from french).",
    "html": "(I did not copy that irrelevant part)",
}