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I had the exact same problem.  In my case, a MTU of 1400 fixed the issue on my Linux clients.  Also, in my case, ping worked but SSH or HTTPS from a Linux client failed with the default MTU (1500).

Oddly, Windows clients work correctly with the default MTU (1500).

For me, this problem began when I upgraded to 23.7 from 23.1.11.

I have file a bug report that references your forum post (the 400 Bad Request one).  The SSL_ERROR_INTERNAL_ERROR_ALERT is a different issue.

https://github.com/opnsense/core/issues/4917

I have filed a bug report that references your forum post.

https://github.com/opnsense/core/issues/4917