They had two whole seasons recorded before it was cancelled.
What do you mean by recorded? Because if you mean what I think, I find that hard to believe.
Voice recording. Dee Bradley Baker has come out and said as much.
I somehow doubt very much that that’s actually true.
The Lost Missions were 13 episodes long. They’ve publicly shown an additional eight episodes in rough animatic form, comprised of two arcs, the second of which was the season 7 opener. As well as a glimpses of fully voiced scenes from two other arcs that were four episodes long each.