What purpose does a "?" serve in a URL if not for query parameters?

I have found some URL's in a website which contain a question mark in the path. These URL's do not contain any query parameters, so I'm wondering is this just a mistake by the developer, or are these question marks serving some purpose that I'm not aware of?

The URL's work find in a browser (not so much in a scraper).

https://www.dutyfree.co.il/בשמים-וקוסמטיקה/Skincare/yves-saint-laurent-top-secrets-cream-4?ml

https://www.dutyfree.co.il/בשמים-וקוסמטיקה/Skincare/premier-dead-sea-luxury-foot-cream-moisture-set-2x5?ml

https://www.dutyfree.co.il/בשמים-וקוסמטיקה/Skincare/kiehls-super-multi-cream-5?ml