How to prevent the personalized image from sending on messages 2 and 3?

When using the master sending sub-account setup — is there a way to prevent the personalized image from sending on messages 2 and 3? Even when the image field is not included in the webhook payload for messages 2 and 3, the contact field retains the URL from message 1 and the image still attaches to every subsequent message. How do you handle this? Is there a way to clear the field between messages, or is the image intended to send on every message in Clay's system?

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