Validation fails on a preferred-citation object

[logological]

I'm using a GitHub Action with cff-validator@v4 to validate this CITATION.cff file using version 1.2.0 of the schema. This always fails with the following error:

field	message
cff["preferred-citation"]	referenced schema does not match

However, I can't spot any problem with the file, and another CFF validator, cffconvert, thinks the file is valid:

$ cffconvert --validate -i CITATION.cff 
Citation metadata are valid according to schema version 1.2.0.

I've tried removing or changing certain lines I think cff-validator might be choking on and rerunning cff-validator, but I wasn't able to isolate the problem. (The Action takes a long time to run and I couldn't figure out how to run the tool locally.) Is it possible there's a bug in cff-validator's processing of preferred-citation objects?

[logological]

One more data point: the yajsv validator also thinks my file is valid:

$ wget -q https://raw.githubusercontent.com/citation-file-format/citation-file-format/refs/heads/main/schema.json
$ cp CITATION.cff CITATION.cff.yaml
$ yajsv -s cff.json CITATION.cff.yaml
CITATION.cff.yaml: pass

[dieghernan]

This should be fixed soon in cff-validator@v5, see test in main branch:

• Action: https://github.com/dieghernan/cff-validator/actions/workflows/cff-validator-tests.yml
• Test file:

cff-validator/examples/key-tests/CITATION_languages.cff

Lines 1 to 56 in 8398af2

	cff-version: 1.2.0
	title: GPP
	abstract: "GPP is a general-purpose preprocessor with customizable syntax,
	suitable for a wide range of preprocessing tasks. Its independence from any
	one programming language makes it much more versatile than the C preprocessor
	(cpp), while its syntax is lighter and more flexible than that of GNU m4.
	There are built-in macros for use with C/C++, LaTeX, HTML, XHTML, and Prolog
	files."
	authors:
	- family-names: Auroux
	given-names: Denis
	orcid: "https://orcid.org/0009-0006-4607-2546"
	- family-names: Miller
	given-names: Tristan
	orcid: "https://orcid.org/0000-0002-0749-1100"
	license: "LGPL-3.0-or-later"
	repository-code: https://github.com/logological/gpp/
	keywords:
	- preprocessor
	- "macro processor"
	message: "To refer to GPP in a publication, please cite the journal article in
	preferred-citation."
	preferred-citation:
	authors:
	- family-names: Miller
	given-names: Tristan
	orcid: "https://orcid.org/0000-0002-0749-1100"
	- family-names: Auroux
	given-names: Denis
	orcid: "https://orcid.org/0009-0006-4607-2546"
	title: "GPP, the Generic Preprocessor"
	type: article
	doi: 10.21105/joss.02400
	issn: "2475-9066"
	journal: "Journal of Open Source Software"
	languages:
	- en
	license: "CC-BY-4.0"
	year: 2020
	month: 7
	abstract: "In computer science, a preprocessor (or macro processor) is a tool
	that programatically alters its input, typically on the basis of inline
	annotations, to produce data that serves as input for another
	program. Preprocessors are used in software development and document
	processing workflows to translate or extend programming or markup languages,
	as well as for conditional or pattern-based generation of source code and
	text. Early preprocessors were relatively simple string replacement tools
	that were tied to specific programming languages and application domains,
	and while these have since given rise to more powerful, general-purpose
	tools, these often require the user to learn and use complex macro languages
	with their own syntactic conventions. In this paper, we present GPP, an
	extensible, general-purpose preprocessor whose principal advantage is that
	its syntax and behaviour can be customized to suit any given preprocessing
	task. This makes GPP of particular benefit to research applications, where
	it can be easily adapted for use with novel markup, programming, and control
	languages."