I am confused about which side of the bar time is open?
The description in the manual seems to be contradictory.
At section: BarPeriod
For instance, a 10-minute bar ending at 12:00 contains all ticks with timestamps from 11:50:00.000 until 11:59:59.999.
Which means the bar time is right side opened(not includ 12:00:00).

At section: Bars, Ticks, Candles. Glossary of Terms.
A 1-hour bar ending at 12:00 contains all ticks with timestamps greater than 11:00:00 and less or equal to 12:00:00.
Which means the bar time is right side closed(include 12:00:00).

I test, it is right closed

If you mean with 'right' the close of the bar, then you are right that the close is right.