Foxes don't eat a potato

Hello!

I'm playing on the version 19w36a and have a problem. I tamed a fox, and gave it a potato. During much time, fox didn't eat it. The fox held it in the mouth. Sometimes sounds of eating are heard and the animation of eating is visible. 

I don't know what to do, because fox don't drop the potato from the mouth. Even if I drop a food near fox, it still doesn't drop the potato .