Turns out it wasn’t related to theses server block. I had forgotten a server block for another domain with instructions that made all the connections fail on port 443.
I didn’t followed a guide, there is a lack of tutorial for it. I’ve just used your guide for HAProxy with SSL and adapted it to match my needs (nginx and acme).
I may write a guide about it, tell me if you would be interested ! If you’re not, know that following the same logic you had for HAProxy, using Nginx official documentation is sufficient.
Thanks for the help !