Power Query Discrepancy

We have different values appearing in Power Query on service vs desktop

SOURCE_VALID_TO

When the text is extracted the underlying value is the same

This is the end of a time series date.. so its a bit different from a normal date

The problem is when we put a filter on this date... what should we filter for 1816 or 9999?

It would be good if this can be standardized across service/desktop

If i am missing something obvious here let me know