Symptom: Over the last time several files uploaded by the cross-wiki upload appear in https://commons.wikimedia.org/wiki/Category:Language_templates_with_no_text_displayed, e. g. https://commons.wikimedia.org/wiki/File:Kmeans2.png.
Reason: This is because the description contains {{en|...}} instead of the more safe {{en|1=...}}. The latter one is more safe when the description contains special characters such as =.
Solution: Please modify ForeignStructuredUpload.prototype.getDescriptions accordingly.