alot of the flying rocks of pandora eerrr the mistlands do that. thats why i refer to them as such. ancient armor mistland rocks and mistlands blue lantern posts ALL float. they dont fall..
same for petrified bones. tho these will crumble if enough total dmg was dealt to it but mineing them out is PAIN because of them likeing to stay floaty.

i hope the devs address some of this. the game simply doesnt regognize some of these objects in the air correctly currently and its only in the mistlands biome. thats because they all have 1 thing in common : all are NEW ASSETS. so this is simply a bug on these assets that needs to be fixed sooner or later. granted its not a critical bug.

but dont build your base on a floating lanternpost. otherwise a future patch WILL make your base crumble to dust.

i guess the new patch might fix some of these hopefully.

i just had an ancient armor floating in mid air over ocean water yesterday. RIP ironscrap. all feel into the sea.