LinkedIn & Slack ignore translated meta tags

Question

Our website is a WordPress site with 2 different languages. Original is German and we use Weglot plugin for translation into English.

So the problem is that LinkedIn and Slack are picking the German metadata when sharing the English version.

Here're meta tags from https://www.example.com/en/

    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0" />
    <title>Title in English</title>
    <meta name="description" content="description in english" />
    <meta name="robots" content="noodp" />
    <link rel="canonical" href="https://www.example.com/en/" />
    <meta property="og:locale" content="en" />
    <meta property="og:type" content="website" />
    <meta property="og:title" content="Title in English" />
    <meta property="og:description" content="description in english" />
    <meta property="og:url" content="https://www.example.com/en/" />
    <meta property="og:site_name" content="Company" />
    <meta property="og:image" content="https://www.example.com/wp-content/uploads/image.png" />
    <meta property="og:image:width" content="1383" />
    <meta property="og:image:height" content="1195" />
    <meta name="twitter:card" content="summary" />
    <meta name="twitter:description" content="description in English" />
    <meta name="twitter:title" content="Title in English" />
    <meta name="twitter:image" content="https://www.example.com/wp-content/uploads/image.png" />

    <script type='application/ld+json'>
      {
        "@context": "http:\/\/schema.org",
        "@type": "WebSite",
        "@id": "#website",
        "url": "https:\/\/www.example.com\/",
        "name": "Title in German",
        "potentialAction": {
          "@type": "SearchAction",
          "target": "https:\/\/www.example.com\/?s={search_term_string}",
          "query-input": "required name=search_term_string"
        }
      }
    </script>
    <script type='application/ld+json'>
      {
        "@context": "http:\/\/schema.org",
        "@type": "Organization",
        "url": "https:\/\/www.example.com\/",
        "sameAs": [],
        "@id": "#organization",
        "name": "Company",
        "logo": "https:\/\/www.example.com\/wp-content\/uploads\/2017\/01\/122.png"
      }
    </script>
<link rel="alternate" hreflang="de" href="https://www.example.ht/"/
<link rel="alternate" hreflang="en" href="https://www.example.ht/en/"/>

Every other possible network, incl. WhatsApp and iMessage are displaying correct language.

When I check https://www.linkedin.com/post-inspector/inspect, I see that it loads all the German meta.

In the URL information it says:

Fetched URL https://www.example.com/en/
Canonical URL https://www.example.com/

URL redirect trail: 1: 200 Success

How do I debug this issue?