Reproduce:

• Open an embedded form with a date field in tasklist
• In the date input field, remove all potentially existing content
• Submit the form

Expected:

• Request payload for variables contains {value: null, type: "Date"}

Observed:

• Request payload for variables contains {value: "Invalid date", type: "Date"}

Hint:

• Moment converts the null value to the Invalid date string when trying to add timezone information