Travis Tansley

I doubt this is a bug, but is intended behaviour. Orchids generate in the swamp biome which you are in and can generate on dirt even underground. This happens in any biome that can generate grass, flowers etc..

Confirmed for 18w47b. Also the Ocean Ruin seemed to create a garbled mess on
Seed: 3370055271394367064 and at Coordinates: /tp @s -1008 ~ -226
On this Seed you can also see two Ocean Ruin's spawning above water (which apparently "Works as intended") to which the loot cannot be opened, even when the chest is waterlogged.

Confirmed for 18w47b. I created a new world and waited 5+ mins, but the world wouldn't load until I hit esc. They have said on the Minecraft website "Numerous worldgen performance improvements", which I find to be subtle.

Edit: I also did /locate Village to see how well the world would generate from teleporting, however to little surprise the world was loading extremely slowly, even when hitting esc.
(I know my laptop sucks however in previous versions of the game it could still load the world at a reasonable pace)