Sugar is a good thing, sure, but jungle can spread on it.
Not really.
Sure, you could get super unlucky and it could spread on turn 1.
But apart from that... you can park your scout on it until your borders expand, then you're gonna work that tile until the corn is farmed, and then you're gonna farm it. So that leaves another 2-turn window before your worker's on it where the jungle could spread (again, unlucky, and you could, if paranoid enough, get your scout back on it for that short window).
But if SIP, then jungle will spread on it, leaving settling on it as your only option...
When it's in your BFC you no longer can settle on it.
... but why would you do that?
I thought about it before posting my earlier comment. Settling on a calendar ressource is a usual good move. But here?
It's a jungle-choked city, with no power tile to work, probably unhealthy as size 1!
I know that I tend to plan further ahead than is considered good play, but even I want my early cities to be able to contribute meaningfully to my empire (which means mainly workers and settlers early on).
I can't see such a city as a meaningful early contributor.
On the other hand, a city NE of the Corn would be such a city, and SIP blocks it.