… aka the perfect recipe for endless deadlock and foreign entities trying to exert influence by “swaying” one member’s opinion. Decisions made by a qualified majority (2/3, 3/4) would be much more appropriate for today’s EU.

Solved: It was an oversight on my part: I didn’t include the “.well-known” part in the backend block. When changed as follows (compare above), it works as expected -

    ## Backend                                                                                                                                                                                                  
    location ~ ^/(api|pictrs|feeds|nodeinfo|.well-known) {                                                                                                                                                                  
      proxy_pass http://127.0.0.1:8536;                                                                                                                                                                         
      proxy_http_version 1.1;                                                                                                                                                                                   
      proxy_set_header Upgrade $http_upgrade;                                                                                                                                                                   
      proxy_set_header Connection "upgrade";