Slightly simpler MWE:
\setuppapersize[A6,landscape]
\setupinteraction[state=start]
\setuptagging[state=start]
\starttexdefinition IndexPageCommand #1
\doifsomethingelse{\currentregisterpageuserdata{note}}
{n\currentregisterpageuserdata{note}}
#1
\doifsomething{\currentregisterpageuserdata{id}}
{\in[\currentregisterpageuserdata{id}]}
\stoptexdefinition
\defineregister[Pindex]
\setupregister [Pindex][pagecommand=\IndexPageCommand]
\starttexdefinition tolerant protected unexpanded PIndex
[#1]#:#2#*#=#*#=
\doifelse{#3}{}
{\setregisterentry[Pindex][keys={#1},entries={#2}]}
{\setregisterentry[Pindex][keys={#1},entries={#2}][#3]}
\stoptexdefinition
\starttext
\PIndex{OK, Entry}
\PIndex{OK, Entry1}[note={ote}]%
Here is some text.
\startendnote
\PIndex{Bad, Entry2}
\PIndex{Bad, Entry3}[note={ote}]%
Here is an endnote.
\stopendnote
\page
\placenotes[endnote]
\page
\placeregister[Pindex]
\stoptext
Fails with tagging and/or interaction enabled. Succeeds with both disabled.
--
Rik
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