That's okay. I am used to being wrong. In this case, though, it turns out my '97 jazz guard has a beveled edge. The edges on my MIJ Jaguar, my Lakland 4460, and my Carvin SB5000 are all straight.
All my Fender Jazz bass PG's have beveled edges bordering the control plate. So I'm tempted to say that's the norm. But I just checked my Fender Jag, and it has squared-off edges at the control plate. So it seems you were right on that count.