The reason why the column names with '.' are being truncated is because the binding path parser interprets them as full stop character. More information about paths and character escaping can be found in the Binding Declarations Overview. For your convenience, I prepared an example to demonstrate how to prevent this undesirable behavior. Please take a look at the implementation and consider how this approach fits your scenario.
I hope that this helps. Should you have any other questions, do not hesitate to contact us.
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