The problem is:
the_post_thumbnail() outputs its content immediately. It’s basically like echoing instead of returning.
To fix it, you should be able to just replace
the_post_thumbnail('thumbnail', ['class' => 'droplet-img', 'title' => get_the_title()])
with
get_the_post_thumbnail('thumbnail', ['class' => 'droplet-img', 'title' => get_the_title()])
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