Set-UDElement not working with New-UDDatePicker

I have this component:

New-UDDatePicker -Label $t.startDate -Id "startDate" -Value $InitialDate -Format "dd.MM.yyyy HH:mm"

I used this as a workaround, since there is an open issue with the date format New-UDDatePicker issue with format dd.MM.yyyy HH:mm:ss

Set-UDElement -Id 'startDate' -Properties @{
    Value = '31.12.2021 00:00:00'

Now with 1.5.3 and 3.2.1 Set-UDElement is not working anymore for me. Nothing else changed. Any hints?