AOR_Report.js can't find date parameters

I have been looking at a report that has date parameters. Page 1 shows 429 records:

When going to next set of records there are none:

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Looking at function changeReportPage in AOR_Report.js it is referring to the date input fields in this way:

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But the date parameter IDs in the page end with _date:

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Consequently are always undefined when changeReportPage is called and the result is no records.

A rewrite of the js gets it working but I wondered if I am missing something here.

I am using version 7.10.29