I tried to manually construct urls to this post for each frontend from my instance. Does that help?
Reference: https://lemmy.today/post/59157611
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https://vger.app/posts/lemmy.today/c/lemmyshitpost@lemmy.world/comments/59157611 (works)
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https://phtn.app/post/lemmy.today/59157611 (works but redirects to lemdro.id)
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https://blorpblorp.xyz/home/posts/https%3A%2F%2Flemmy.today%2Fpost%2F59157611 (works)