Matrix to Gantt chart - Error in date display

Hello 

I am trying to create a Gantt chart using powerbi matrix and came across the following material.

https://community.fabric.microsoft.com/t5/Community-Blog/Think-inside-the-box-Custom-visuals-using-Standard-Visuals/ba-p/712092

Though I succeded, there seems to be some error in getting all fields displayed properly

1) Error with dates displayed - it seems to display omitting the actual end date, for example, if the actual end date is December, it is highlighted until November 

2)Missing tasks in monthly view - Missing some of the key tasks in the monthly view in the example "Task 1.2-Confirmed orders"

But if I drill down to days view, I can see that

Is there a way to make all tasks visible in the monthly view and fix the date issues

Dropbox link 

Any help will be highly appretiated