When recording a session, some participants were not recorded

When recording a session, all participants should be recorded.
However, we have encountered an issue where only some participants were recorded.
I think the participants were probably able to converse with each other.

session_id: ybRQ7QgcSpaAxXPOFXsWgA== , bJnXzBHVQ0mxw9su1rJRkA==