A similar question asked "Which masechtot don't really have Rashi?" which proceeded to list the Masechtot (Nedarim, Nazir, Moed Kattan) & parts of Shas (most of Bava Basra, last 4 daf of Makkos) that don't have Rashi's commentary.
Do we know why we don't have Rashi's commentary for these Masechtot? (I know he "died" a few times in Shas)
Were they not written? Did we lose them at some point? Something else?