Bengali font not showing correctly in One Note for Windows 10

I have found a solution in a blog. I am adding the solution here as it is encouraged not to simply share a link of a solution as the link can be obsolete in the future.

To solve the problem stated in the question, one needs to set the OneNote language to Bangla. This can be done by right-clicking on the note and then selecting the 'Bangla(Bangladesh)' or 'Bengali(India)' option in 'Set Language'. If one has already typed some text, then he/she needs to first select all text and then change the language. Also, you need to change the language separately for the 'Title' and the 'Body' of the note.

The corrected output of the image in the question:

The solution was so simple that I was astonished! I am wondering why the Microsoft staff couldn't provide this simple solution although they claimed that they had 'researched' 'a lot' about this issue.