NGINX 1.15.5-1 mainline-version, built statically against OpenSSL 1.1.1 with ngx cache purge and TLS 1.3 final support added to repository. TLS 1.3 works with Google Chrome versions 70 (stable version release scheduled to October 16, 2018). Alternatively, TLS 1.3 support can be tested using Chrome Beta.
We would also recommend you to check whether chrome://flags/#tls13-varian flag is set to “Enabled (Final)”.
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Alternatively, feel free to use our CentOS/RHEL repository.