There's no "industry-wide Leetcode fizzbuzz portion" - Leetcode and fizzbuzz are famously on complete opposite sides of the whiteboard spectrum! I've only been asked actual fizzbuzz once, and can't immediately think of any other duplicate whiteboard problems I've seen either. Many of them aren't ones I've seen on Leetcode, and would probably be on the "easy" scale there if they were there.

I couldn't pick out any single problem that would make everyone at all my last few jobs happy, let alone the whole rest of the industry.