This is explained in the Wikipedia article for the tournament:
As of 31 December 2018, the top nine ranked ICC Full Members, alongside hosts India, qualified directly for the 2021 tournament. Of those ten teams, the top eight ranked sides qualified for the Super 12s stage of the tournament. Sri Lanka and Bangladesh did not qualify for the Super 12s, instead ...
@motosubatsu's answer is very true answer, under normal circumstances. Most games I believe that to be true.
However, upon rereading your question again, I thought of the possibility that your coach (since it appears he stressed the tea break to you, a new player) may indeed 'enforce' actual tea at the break, as a learning experience.
Don't worry overly, it'...
In cricket, "tea" refers to a break between either playing sessions or innings; it is also the name of the supplied food and drink selection at that break.
While there would generally be tea (the beverage) available to drink at tea (the break) it's not typically the only drink available, nor is drinking it compulsory.
As you yourself have noted, the correlation between population and sporting success is fairly weak. China have never been very good at cricket, whereas Australia and New Zealand have consistently been in the top five teams in the world, and Sri Lanka have consistently been in the top ten.
Football is another good example. Of the twenty most ...