This looks a lot like it's the same issue that currently happens on Ubuntu 22.04. Ubuntu 22.04 is based on debian unstable, so if 22.04 has the new openssl then Debian unstable / Siduction is going to have that, too.
I have already fixed this bug in the related oscrypto library (see
https://github.com/wbond/oscrypto/pull/61 ), but that change hasn't been merged by the maintainer yet.
I will try to make the plugin use a forked / modified version of oscrypto until that fix gets into a new release and then the plugin should work again with OpenSSL 3.