New-UDListItem -Label cannot be a number

May be a bug, may be a limitation? @adam

New-UDDashboard -Title 'PowerShell Universal' -content {
    New-UDList -Children {
        New-UDListItem -Label '4' -subTitle "Number Only"
        New-UDListItem -Label '4T' -SubTitle 'Number and Text'
    }
}

image

Weird. Definitely a bug.