Snapdragon also have but pretty rare

Note I answer based on the threads opened by redditors who own S20 and their experiences
Most of those who have the problem are
1.preorder sets (1st batch) and 2nd batch sets (after preorder sets are sold)
2.exynos units (be it asia, europe, etc) especially telco sets, but unlocked sets also do have

For snapdragon sets, those who have are those telco (US, KR) sets. I have not seen the problem in unlocked sets (HK) yet but hope not

Estimated ratio of exynos:snapdragon
75:25