Addons fail to load on first launch when creating worlds from "My Templates" after downloading from "LIBRARY"

Worlds created directly from the "LIBRARY" button work normally, however worlds created from the "My Templates" button (after downloading from "LIBRARY") fail to load addons on the first launch.
On the second launch, addons do load properly, but since the world was incompletely created during the first launch, it becomes unplayable/unable to progress.
This bug can be reproduced with "Hour of Code: Escape Estate."

All of my custom templates are affected by this issue.