Yes, I had seen the picture with chapel from Wiki data before. I thought you did too, since you mentioned Wikidata in the first place.

I’ve imported these building and their data straight from the GURS register, which is the Geodetic Administration of the Republic of Slovenia. I didn’t pay special attention to the dates, but as you pointed out it’s indeed quite unlikely that the chapel was built in 1990. Perhaps it was merely drawn/added to the register then and was mistakenly listed as the date when it was built. No idea.

Anyway, apparently it’s from the 16th century: http://giskd2s.situla.org/rkd/Opis.asp?Esd=4340