citationNoteNum wrong when there are references to example list items

[jgm]

Example, bug.md:

[@buchanan:puzzle]

(@foo)

See @foo.

[@buchanan:puzzle]

[@vontfintel:foo]

[@vonfintel:foo]

Output of pandoc bug.md -t native:

[Para [Cite [Citation {citationId = "buchanan:puzzle", citationPrefix = [], citationSuffix = [], citationMode = NormalCitation, citationNoteNum = 1, citationHash = 0}] [Str "[@buchanan:puzzle]"]]
,OrderedList (1,Example,TwoParens)
 [[]]
,Para [Str "See",Space,Str "1."]
,Para [Cite [Citation {citationId = "buchanan:puzzle", citationPrefix = [], citationSuffix = [], citationMode = NormalCitation, citationNoteNum = 3, citationHash = 0}] [Str "[@buchanan:puzzle]"]]
,Para [Cite [Citation {citationId = "vontfintel:foo", citationPrefix = [], citationSuffix = [], citationMode = NormalCitation, citationNoteNum = 4, citationHash = 0}] [Str "[@vontfintel:foo]"]]
,Para [Cite [Citation {citationId = "vonfintel:foo", citationPrefix = [], citationSuffix = [], citationMode = NormalCitation, citationNoteNum = 5, citationHash = 0}] [Str "[@vonfintel:foo]"]]]

Note how citationNoteNum jumps from 1 to 3, and the second citation gets note number 3.
Removing the reference See @foo prevents the problem. This bug leads to incorrect position calculation in citeproc and missing "ibid" in some cases.

[jgm]

This happens because note number calculation occurs before we know whether @foo is a citation or an example number reference.

[jgm]

The issue is partially resolved, but only for the case where the example list references refer to example list items earlier in the document (not later).