0 evidence. If this were a real privacy leak, the author would ask their coworker if they talked about the unexpected topic instead of

>"Maybe my coworker was talking about this in another session?"

This would be a critical bug that would slash the market value of a T$ company significantly, go ask your coworker or close the ticket, why do you expect the devs to put an enormous amount of effort hunting a potentially inexistent if you can't make that minuscule debugging effort.