I have discussed this specific configuration with our Level II desk and they have confirmed that this lack of real-time update after the Forex chart is loaded is expected. This is due to the fact that the data stream will not fail-over from the primary since it actually does provide the data - regardless of how this mapping is altered.
In this case, you would want to subscribe to the real-time Forex data to resolve this issue.
Please let me know if you have any additional questions.
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