A question about reactive power through a capacitor in LTspice
What I think you're seeing is the start of an exponential where the capacitor is charging. The time constant is 22s and the pulse duration is very small compared with this, so you're only seeing the early stages of the exponential.

In charging a capacitor there is a flow of power in, but the resultant energy is stored and not dissipated.

I don't know why there is no discharge curve; it may be worth decreasing the pulse frequency significantly so that we can see what's happening in the time frame of the time constant. The integration sampling time may also be a factor.