Thread: Getting out of copy out mode

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/15/protocol-flow.html
Description:

In copy out mode it is mentioned "Otherwise, any message type other than
CopyData or CopyDone may be treated as terminating copy-out mode.". This is
confusing to me. Does that mean database might return anything other than
Async messages, ErrorResponse, CopyData, CopyDone, or CommandComplete?