Tag {IMAGE} don’t work in HTML

Hi,
The tag {IMAGE} is not replaced when I received email in HTML. I can see all other images from the post but not the featured image. Can you help me?
I parsed the code “class-s2-core.php” of the pluging and I can not see anything about {IMAGE}?

Version of subscribe2:10.34

Exemple of an email below (the tag is not replaced by the image) :

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PLANTATIONS ET ENTRETIEN DE HAIES
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{IMAGE}

La période automnale est propice à l’entretien, la taille, la plantation des végétaux, et notamment des haies plantées sur les lots des associés …..