This is a lazy stereotype. African and Asian teams aren't typically good at game management because they typically don't have enough quality players with experience at the highest level of the game. Plain and simple. What happened in Russia is a fluke, it's unlikely to happen again. But the simple truth is there's a reason why so few African and Asian players play consistently for the likes of Madrid, Barcelona, Bayern, etc, and it's not down to racism or discrimination(that won't prevent those clubs from signing Nigerian Pelé). Beyond the 5 already playing for biggish clubs(salah, mane, koulibaly, benatia, son) was there someone else that looked like he belonged at a big club?
I don't know if you only want to talk about African players playing at the World Cup, but I think there are some great/good players you didn't mention
Salif Sane - third best CB in Bundesliga last season behind Naldo and Pavard, just signed for Schalke, BVB wanted him
Victor Moses - regular at Chelsea title winning side, probably not a very good player but it's not like there are a dozens of world class RBs out there
Riyad Mahrez - POTY in PL, wanted by City
Wilfried Zaha - maybe not fit for Barcelona, but good enough for Arsenal, Spurs etc.
Aubameyang - great goalscorer in Bundesliga and PL
Naby Keita - good enough for every midfield in the world besides Real Madrid and City
Eric Bailly - big talent, injury problems, a bit rash
Jean Michael Seri - wanted by many top sides last summer
Plus some talents like Armine Harit (Rookie of the year in Bundesliga) and Amadou Haidara (very good with Salzburg in EL) who have it in them to step up to a bigger club rather sooner than later.
I think the problem is that talent is spread out over many different sides and not like South America where there are just 10 nations or something. Imagine a best of Africa XI
GK
Moses Koulibaly Benatia Bailly
Sane Keita
Salah Mahrez Mane
Aubameyang
Better than any side in the PL bar City despite me not thinking hard enough to find a GK or LB