SOLVED
Found the solution. Still had proxy directives in nginx config envs other than location / {}. So it was again an error introduced by an nginx config deviating from the recommendation by https://docs.nodebb.org/configuring/scaling/ .
How to change user ids for session sharing plugin
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We are using this plugin: https://github.com/julianlam/nodebb-plugin-session-sharing
We changed our user ids from int to guid and now of course the user mapping of the session sharing plugin creates new users.
How can we replace the old int ids with the new guids?
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@florian-rubel did you ever figure this one out?