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Thanks to @SteveHolgado I found the answer: had to add :key
attribute in the parent v-for
and wrap each slot
in the child in its own div:
<template>
<div>
<div v-for="ctr in maxItems">
<slot :name="'s-' + (ctr + startItem - 1)"></slot>
</div>
</div>
</template>
Source:stackexchange.com