Nginx: Hide server signature - nginx

Question

I have read a lot of questions on StackOverflow. For many people they were helpful, but for me not.
I need to hide the server name, or at least change it.
I wrote a docker file, to download a dynamic module and inject it into the configuration in the next step.
ARG VERSION=alpine
FROM nginx:${VERSION} as builder
ENV MORE_HEADERS_VERSION=0.34
ENV MORE_HEADERS_GITREPO=openresty/headers-more-nginx-module
RUN wget "http://nginx.org/download/nginx-${NGINX_VERSION}.tar.gz" -O nginx.tar.gz && \
wget "https://github.com/${MORE_HEADERS_GITREPO}/archive/v${MORE_HEADERS_VERSION}.tar.gz" -O extra_module.tar.gz
RUN apk add --no-cache --virtual .build-deps \
gcc \
libc-dev \
make \
openssl-dev \
pcre-dev \
zlib-dev \
linux-headers \
libxslt-dev \
gd-dev \
geoip-dev \
perl-dev \
libedit-dev \
mercurial \
bash \
alpine-sdk \
findutils
SHELL ["/bin/ash", "-eo", "pipefail", "-c"]
RUN rm -rf /usr/src/nginx /usr/src/extra_module && mkdir -p /usr/src/nginx /usr/src/extra_module && \
tar -zxC /usr/src/nginx -f nginx.tar.gz && \
tar -xzC /usr/src/extra_module -f extra_module.tar.gz
WORKDIR /usr/src/nginx/nginx-${NGINX_VERSION}
RUN CONFARGS=$(nginx -V 2>&1 | sed -n -e 's/^.*arguments: //p') && \
sh -c "./configure --with-compat $CONFARGS --add-dynamic-module=/usr/src/extra_module/*" && make modules
FROM nginx:${VERSION}
COPY --from=builder /usr/src/nginx/nginx-${NGINX_VERSION}/objs/*_module.so /etc/nginx/modules/
COPY devops/nginx/nginx.conf /etc/nginx/
EXPOSE 81 82
CMD ["nginx", "-g", "daemon off;"]
Then, I added the module into the nginx.conf file. (I also tried to load the module without "")
load_module "modules/ngx_http_headers_more_filter_module.so";
And finally, I wrote into http block
http{
more_clear_headers server;
more_set_headers "server: hidden";
server_tokens off;
proxy_pass_header server; //Tried to add it for reverse proxying, but it did not work
}
Only server_tokens off; works. I have removed nginx version, but not it's signature. more_clear_headers and more_set_headers do not affect it. What am I missing?
P.s. Checked the modules folder in the server, and my module loaded correctly
P.p.s. Tried Server with capital S, and it did not work either. (As many suggested, but my response returns it with lowercase)