Tracks showing up hidden

[vinnyvenditto1]

Hello, I’m currently on pro tools 2021. My partner is on pro tools 10 and will not upgrade at all lol. We are recently having an issue. When he sends me or anyone a session from pro tools 10 and me or the receivers has a newer pro tools all the tracks are hidden. They are active but they are hidden. If we send a pro tools session to another pro tools 10 it opens just fine. Here is where I’m really confused. A writer I work with (a completely different person) has pro tools 10 and only uses Pro tools 10 and I get sessions from him and everything works just fine. No hidden tracks or anything.