Zwift won't adjust power and terrain after latest Wahoo KICKR firmware v4.21

Identical issue following the latest Zwift update on Apple TV and KICKR firmware update.
Terrain on free rides and power targets on structured workouts lag by an increasing amount (30 seconds to start, then a minute, then two minutes behind…) over the course of every ride. I’m able to control power targets on the KICKR manually through the Wahoo app on my phone while leaving it paired as a passive power meter on Zwift for now, but that’s a suboptimal and annoying solution.

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