Stats page access over SSL fails at "Error code: SSL_ERROR_NO_CYPHER_OVERLAP"; no-SSL, ok

[PGNet Dev]

I've enabled stats on haproxy 1.8.10

With

        haproxy.conf
                ...
                listen stats
                        ...
                        bind 192.0.2.1:1234
                        ...

the non-ssl stats web page is fully accessible/functional.

If I enable ssl for it, 1st concatenating my crt & key

        cat haproxy.crt.pem haproxy.key.pem > haproxy.CONCAT.crt.pem

Checking the cert, with my CA cert

        openssl verify \
         -CAfile /usr/local/etc/haproxy/ssl/myCA.CHAIN.crt.pem \
         /usr/local/etc/haproxy/ssl/haproxy.CONCAT.pem
                haproxy.CONCAT.crt.pem: OK

Verifying cipher support

        openssl ciphers -tls1_2
                
...:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:...

then configuring

        haproxy.conf
                global
                        ...
+                       ssl-default-bind-ciphers 
ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305
+                       ssl-default-bind-options force-tlsv12
                        ...
                listen stats
                        ...
-                       bind 192.0.2.1:1234
+                       bind 192.0.2.1:1234 ssl crt 
/usr/local/etc/haproxy/ssl/haproxy.CONCAT.crt.pem ca-file 
/usr/local/etc/haproxy/ssl/myCA.CHAIN.crt.pem
                        ...

secure access to the stats page fails,

        Cannot communicate securely with peer: no common encryption 
algorithm(s). Error code: SSL_ERROR_NO_CYPHER_OVERLAP 

I regularly use my generated certs/keys with CHACHA20 ciphers elsewhere, so 
they're not _inherently_ the issue.

If not a simple config issue on my end, I suspect it's possible this is (?) 
related to the 'mystery' Openssl lib linking issue I've having, @ 
https://www.mail-archive.com/haproxy@formilux.org/msg30448.html