Yeah, it's a weird bug-like feature and makes me wonder why there even is a worm crystal in the first place, but good luck getting the fanboys to acknowledge that. Would've been a far better solution to have the holy mountains be safe from spiders and worms and then give players the choice to shatter the worm crystal in return for some benefit or another.
Typically when this is brought up you'll have fanboys insist they don't see the problem because with 12489 hours put into the game they can kill Steve easily, but it's ruined many a beginner player's run.