Reports

Changing the order of the imports fixes it. Old:

<script src="MyParentElement.js" type="module"></script>
<script src="MyChildElement1.js" type="module"></script>
<script src="MyChildElement2.js" type="module"></script>

New:

<script src="MyChildElement1.js" type="module"></script>
<script src="MyChildElement2.js" type="module"></script>
<script src="MyParentElement.js" type="module"></script>

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