ERG not working may21

Following the recent update I have noticed in workout mode ERG is failing me.

Traditionally ERG would adjust resistance to meet the number prescribed in the workout block but have noticed not just today that I was spinning out when trying to hit a hard 1 min interval and resistance was not adjusting. I have the latest firmware update on my kickr and the latest Zwift update. Anyone else experiencing the same issue and any idea what’s going on?