Here's how I found it:
I created a CL 11-19 chart with 1-Tick bars, 5 days back, using the Default 24x7 template.
It had existing historical data and the chart loaded with that historical data.
Then, at about 08:57, I connected to the data source, CQG, in my case.
Figure1 (appears on the right in the thumbnails below) shows the chart moments the data connection has been established.
It shows that there is a tick at 08:57:01.664, which is missing from the recorded historical data.
Then, I disconnect and reconnect the data source. Figure2 (appears on the left in the thumbnails below) shows the extra tick no longer appears on the chart. After the disconnection and reconnection cycle, the chart now matches the recorded historical data. However, new data inconsistencies will now be appearing on the chart at just after the time of the most recent connection.
It appears that the chart almost always loads erroneous data at just after the moment of connection.
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