You'll destroy the pool doing that, for the future the correct procedure would be:
Stop the array, if Docker/VM services are using the cache pool disable them, unassign all cache devices, start array to make Unraid "forget" current cache config, stop array, reassign all cache devices, re-enable Docker/VMs if needed, start array.
Alternatively you can also do a new config and reassign all devices, then check parity is already valid before starting the array.