Subquery from trend diagram includes matches with no date

[arildm]

1. Search for "fisk" in the Skönlitteratur corpora and show statistics: https://korpdev.spraakbanken.gu.se:9111/#?corpus=aspacsv,rom99,romg,romi,romii,saltnld-sv,storsuc&cqp=%5B%5D&show_stats&search=word%7Cfisk&page=1&result_tab=2
2. Open trend diagram
3. Click in the diagram at the year 1842
4. A new KWIC listing will load using a CQP query containing something like [(int(_.text_datefrom) >= 18420101 & int(_.text_dateto) <= 18421231) | (int(_.text_datefrom) <= 18420101 & int(_.text_dateto) >= 18421231)]

• Expected: The three hits from the Äldre svenska romaner corpus
• Actual: First all 31 hits from ASPAC: Svenska and then the three other hits