The values returned by Bars.GetSessionBar() are often false. I have written many, messages here that the session logic is flawed and needs to be reworked. This is just another example.
To facilitate the detection of false values returned by Bars.GetSessionBar(), I have coded a small indicator (attached).
Also you can have a look at the charts below. You can see that GetSessionBar() does not return the correct values for the high, low and close.
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