Erg mode does not hold watts in workouts

Hi there, for the past few months I can’t get Erg mode to work, despite previously having no issues.

More specifically, although Erg mode is selected, and I get accurate power output, it seems the Wattage reflects effort/terrain, rather than workout targets (despite riding at sufficient cadence/etc).

This has been happening for a while so I have followed the Zwift troubleshooting / forum advice but to no avail and I am now at a dead end.

Setup details:
Zwift v1.46.0
Wahoo Kickr Core firmware v1.1.3
MacBook Pro 14”