NGINX Reserve Proxy SSL_ERROR_RX_RECORD_TOO_LONG - ssl

Question

I have a lxc setup here. In one container is the nginx running with a simple html website. In the second container is the nginx reserve proxy running. When I try to open the url https://malte-kiefer.de in the browser, I get this error:
SSL_ERROR_RX_RECORD_TOO_LONG
I check my nginx config on the reverse proxy and there is the ssl in the config:
server {
listen 80;
listen [::]:80;
listen 443 ssl http2;
listen [::]:443 ssl http2;
server_name malte-kiefer.de;
ssl_certificate /etc/nginx/ssl/malte-kiefer.de/fullchain.cer;
ssl_certificate_key /etc/nginx/ssl/malte-kiefer.de/privkey.key;
location / {
proxy_pass http://10.242.93.122:80;
proxy_buffering off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-Forwarded-Host $host;
proxy_set_header X-Forwarded-Server $host;
proxy_connect_timeout 3600;
proxy_send_timeout 3600;
proxy_read_timeout 3600;
send_timeout 3600;
}
}
When I do a curl on the proxy to the nginx container with my html site I get this, a correct answe HTTP 200:
root#proxy:~# curl -I http://10.242.93.122:80
HTTP/1.1 200 OK
Server: nginx/1.14.2
Date: Tue, 14 Jan 2020 04:44:33 GMT
Content-Type: text/html
Content-Length: 2153
Last-Modified: Sat, 07 Dec 2019 04:41:15 GMT
Connection: keep-alive
ETag: "5deb2d6b-869"
Accept-Ranges: bytes
But on my local host I get this:
% curl -I https://malte-kiefer.de ~
curl: (35) error:1408F10B:SSL routines:ssl3_get_record:wrong version number
[35] % curl -I https://malte-kiefer.de -v ~
* Trying 5.252.225.74:443...
* TCP_NODELAY set
* Trying 2a03:4000:40:e0:c47f:24ff:fe7e:b8ad:443...
* TCP_NODELAY set
* Immediate connect fail for 2a03:4000:40:e0:c47f:24ff:fe7e:b8ad: Das Netzwerk ist nicht erreichbar
* Connected to malte-kiefer.de (5.252.225.74) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
* CAfile: /etc/pki/tls/certs/ca-bundle.crt
CApath: none
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* error:1408F10B:SSL routines:ssl3_get_record:wrong version number
* Closing connection 0
curl: (35) error:1408F10B:SSL routines:ssl3_get_record:wrong version number
In my nginx error log I found this:
2020/01/14 05:12:14 [info] 161#161: *1 client sent invalid request
while reading client request line, client: 127.0.0.1, server:
malte-kiefer.de, request: "PROXY TCP4 89.204.135.150 5.252.225.74
10569 443"