LinkedIn post inspector is flaky and limited, and one of the limitations I believe is that it requires TLS 1.2 support. As far as I can see, Webflow supports both 1.2 and 1.3, but you’re using Weglot, which means your www requests are routed through Weglot’s servers instead, which does not appear to support TLS 1.2.
Best guess… if you want to continue using Weglot, but need TLS 1.2 enabled for linked in post sharing, your best option is to check with Weglot support and see if you can resolve it through them. Your configuration might be outdated?
Another option is to reverse proxy your site and handle your own SSL cert and TLS configuration. I don’t use Weglot, but all of my reverse proxied sites support TLS 1.2 and 1.3 and work fine with post inspector.