on our last trip in November, we saw one person using their
ECV all the way through the 'interrogation room' and into the area where guests board the individual ride vehicles for the last part of the attraction.
We've gone on Rise of the Resistance many times and never saw that before. Either guests said they could walk/stand and left the ECV in the area where it's noted in lanejudy's quote and walked or traded it for a wheelchair at that point. The attraction is wheelchair accessible to the point of boarding the last vehicle.
The person using the ECV was in our interrogation room. The ECV did make it pretty tight and the user had some difficulty getting out to go into the next area.