Why is Hungary vs England kids only rather than behind closed doors?

Monkey chants were directed were also directed at Manchester City star Raheem Sterling and Borussia Dortmund ace Jude Bellingham during England’s World Cup qualifier against Hungary.. As a result of this, the Hungarians were handed a game behind closed doors by Fifa – a penalty that was served during their 1-0 home defeat to Albania in October.

https://www.the-sun.com/sport/5442412/hungary-vs-england-behind-closed-doors-kids-only/