{{system.DateTime}} token doesn't work in Marketo form
I want to create a Snooze option in the preference center. I created a DateTime field and used it in a form, I set the stored like this:

It used to work perfectly until today, the stored value was 1 or 3 months away from the form submission date. Now I tried to test it again, and nothing happens, the value isn't written in the logs (even if I use the token only, without adding more days to it). Does anyone know if anything changed in Marketo or why else it could stop working?
Thanks,
Anastasia