Nextcloud reverse proxy fail

I have nginx running as basically a reverse proxy sitting in front of several apps running in docker, when i try and use nextcloud i’m getting issues being able to upload photos to the server and such

the only real error i can see is on nginx debug logs

2023/04/20 12:22:32 [info] 477#477: *4023 client sent invalid header: “http.protocol.single-cookie-header” while reading client request headers, client:, server:, host: “

there are no errors in the error log on either the nginx reverse proxy or the nginx logs from the nextcloud container

does anyone have any ideas for the cause/fix for this? thanks