Dynamic images with 29Next

Hello wonderful Klaviyo community! I have a client who uses the store platform 29Next, and recently the abandoned cart dynamic images stopped populating.

When I look at the preview, there is no property for an image. This is the code that was used (prior to my starting with this client) to pull up the dynamic images, but they aren’t populating anymore.

{% if event.CheckoutURL|slice:"0:21" == "https://www.nanosocks" %}{{ item.ImageURL }}{% else %}{{ event.ImageURL }}{% endif %}

ny insight into how I could fix this would be wonderful. Thank you!