Mix is running interactively

[Draggu]

Mix is running interactively and prints to stdout, which leads to a permanent communication failure. I looked through calls, but there are already --force --if-missing flags. I guess it is coming from a different command calling mix local.hex under the hood

2026-03-02 14:22:42.640 [info] [Error - 2:22:42 PM] Client Expert: connection to server is erroring.
Header must provide a Content-Length property.
{"mix requires the hex package manager to fetch dependencies\nshall i install hex? (if running non-interactively, use \"mix local.hex --force\") [yn] content-length":"172"}
Shutting down server.