The StockChart in example "Bind a Candlestick Stock Chart to a model" is not rendering the last data point from April 1, 2019. It appears that the reason is the Navigator integration - if you remove it, then the data point will show.

Also, if you increment the last data value by just one second - DateTime(2019, 4, 1, 0, 0, 1) - then April will show on the Navigator and the data point will display in the Chart.