Zwift recently lost the data for my effort in the Chasing Cancellara TT on the 14th. Zwift support told me it was because I didn’t logoff from my warm up and log back on for the event. AND then log off and log back on for the cool down. They pointed me to the FAQ’s that say you need to do this.
I can’t imagine the cluster-eff that would happen if they allowed saves without exit!
Here’s my thread about it: Lost Events or Data? This May be Why