There seems to be a 250 character limit for Wikidata item labels.
Zotkat's Wikidata export translator maps the Zotero's item title to the label of the Wikidata item to be created. However, it doesn't fail if the title is > 250 characters.
Consider using the Zotero's item Short Title field as an alternative for cases where the title is longer than 250 characters.
There seems to be a 250 character limit for Wikidata item labels.
Zotkat's Wikidata export translator maps the Zotero's item title to the label of the Wikidata item to be created. However, it doesn't fail if the title is > 250 characters.
Consider using the Zotero's item Short Title field as an alternative for cases where the title is longer than 250 characters.