[NTG-context] startregister produces strange page range ("1-2-3")

With the following minimal file, the index entry for Knuth has the strange page range "1-2-3" rather than "1-2, 2-3". Adding \input knuth a few times in between the two start..stopregister stanzas gives a correct page range (so maybe that change hides the problem). I'm using ConTeXt 2008.10.31 (Mk II) from the Debian unstable packages. The live context (2009.03.06) produces a blank index with the pdftex engine, so I'm CC'ing Patrick in case that problem is separate. \starttext \startregister[index][Knuth]{Knuth} \dorecurse{5}{\input knuth } \stopregister[index][Knuth] \startregister[index][Knuth2]{Knuth} \dorecurse{5}{\input knuth } \stopregister[index][Knuth2] \completeindex \stoptext -Sanjoy