The-Position-Metrics-visualizer-doesn-t-graph-SetPositionMetric-metrics

I'm setting two SetPositionMetric(...) user-defined metrics on the Transaction class shown in the code below. I know the Position objects are picking them up okay because I can plot them out in BacktestComplete using ScottPlot. And that works very well.

However, when I try to plot them with the Position Metrics performance visualizer, I get nothing as shown below. Is this visualizer dysfunctional for these types of metrics, or am I just using it wrong? I'll add, this visualizer works for all other metrics, except those set with the SetPositionMetric(...) method.