Solution is simple, check that is_admin() returns false before doing any modifications to the content, or hook on admin_init to add you hooks.
I don’t think that the_content is used in the context of admin, but thumbnail generation might be used.
Another thing to keep in your mind is that those hooks might be triggered when AJAX/REST responses are generate (depending on their content), at which case it is not obvious whether you should still use lazy loading at all.
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