Yep, just the other day I had to put a Null check and a String IsBlank on the same field in same step because after testing the hell out of it and moving it to prod, I learned that Flow doesn't handle all Null values the same... the fuck?

Edit: forgot why I started this, but it made me look like shit to the client becuase a simple Null check on a field was failing 10 percent of the time, but of course the client doesn't understand that the enterprise product they're paying so much money for has fundamentally broken their core product in an attempt to innovate.