Original title for "Yakushima's Illusion" / "L'illusion de Yakushima"

Naomi Kawase's latest film has 2 titles, which both appear on the film page of the Locarno Film Festival (world premiere):

• "Yakushima's Illusion" (title in English), regarded by Crew United as the international title (not the original title);
• "L'illusion de Yakushima" (title in French).

According to Unifrance, the film is mostly a French production: "Majority French (France, Japan, Belgium, Luxembourg)", with Cinéfrance Studios being the main production company.

The current original title on the IMDb is "Yakushima's Illusion". But the rule is that the original title should be the title for the production country. Shouldn't this be the title in French?