Sometimes they do bug out and are indestructible.
One time I found six meteorites on the ground, one was indestructible.
But explosives and foundations are a waste. Try this next time.
It’ll be cheaper, faster and easier.
4 poison + 1 demonfire is usually enough but 5 poison +1 demonfire has ‘always’ been enough for me.
Both orbs are pretty cheap and easy to get these days.
So if you don’t at least see a crack after trying this method, just leave and find another.
If you do see a crack, drop one more demonfire.