Dynamic Content (ie Liquid code in emails)?

I have had a number of occurrences where the code has not rendered correctly.

I am not getting an error message, but the code is only returning numbers…So if my custom field (EventDate7) has the date of 24/09/2022 and the code is [[ contact.custom_fields.EventDate7 | custom: “EEEE, dd MMMM YYYY” ]] it is still coing back as 24/09/2022, not Saturday, 24 September 2022.

This is a real problem, as we have some events that run across multiple days, so I use the | plus: 1 day | bit as well. This is a real problem, as we have some events that run across multiple days, so I use the | plus: 1 day | bit as well.