Yeah, this.The most logical answer is that since ALttP came out before the Zoras were clearly defined in OoT, Nintendo didn't have a clear idea of what they were doing. In-universe answer, perhaps they grew sick of the Hylians over time. Happens.
Zola:There's a theory floating around they they're female Zoras who are violent (?!), but there's absolutely no solid evidence for this. I don't know where it originated, but it's most definitely not proven.