Hi folks,
I did spend a bit of time looking into this but couldn’t see it happening when I did nor was I able to do a lot of deep digging in retrospect without some more details.
Tobi, what we could use at this point is probably the x-nf-request-id (cf this article: [Support Guide] Netlify Support asked for the 'x-nf-request-id' header? What is it and how do I find it?) and hopefully a HAR file (HAR Analyzer) of you seeing it, since I couldn’t manage to reproduce it and our logs aren’t super clear about what is being served (once the files have been compressed, the english and german versions are pretty close in size so it isn’t very easy to pick out from our response_size logs which version is being served at which URL).
Thanks again for your help in troubleshooting!