'Missing page content when using generator in Wikipedia API

I'm using the categorymembers generator in Wikipedia API to retrieve all pages in a category efficiently, for example:

https://en.wikipedia.org/w/api.php?action=query&format=json&prop=revisions&generator=categorymembers&rvprop=content&rvslots=*&gcmtitle=Category%3AAirports%20in%20Chad&gcmlimit=5000

(sandbox link)

But some articles are missing content, for instance page id 40376021 "Tchagen Airport":

"40376021": {
    "pageid": 40376021,
    "ns": 0,
    "title": "Tchagen Airport"
},

However, when I retrieve the individual page, it does have content:

https://en.wikipedia.org/w/api.php?action=query&format=json&prop=revisions&titles=Tchagen%20Airport&formatversion=2&rvprop=content&rvslots=*

(sandbox link)

{
    "batchcomplete": true,
    "query": {
        "pages": [
            {
                "pageid": 40376021,
                "ns": 0,
                "title": "Tchagen Airport",
                "revisions": [
                    {
                        "slots": {
                            "main": {
                                "contentmodel": "wikitext",
                                "contentformat": "text/x-wiki",
                                "content": "page content here (long, ommited)"
                            }
                        }
                    }
                ]
            }
        ]
    }
}

I don't know what's going on here. It's not a recently created page so it can't be a caching issue. How to ensure that content for all pages can be seen in bulk results?

wikipedia-api


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