For this list, and this list only (I likely could identify the issue by comparing raw messages, but I won't bother), when I hit 'r' I get the sender of the latest message. In this case, "ros...@gmail.com". So I have to start typing "pyt" to change it to the list, double tab to body, type, then Ctrl + Enter to send it after 30 seconds.
However, I am SO used to not changing the address (all work related communication is always just 'r', the same for Fedora, SQLite, Wikipedia, etc.) that I end up replying to the wrong address sometimes. -- https://mail.python.org/mailman/listinfo/python-list