will naturally spawned resources like bamboo somehow start to appear in the relevant biomes?
Hi Momand, to answer your question, I’m going to assume some stuff about your question.
I’m going to assume you are talking about the existing world, within our current border.
To put it plainly, any chunks that have previously been explored (so basically everything within the current border) will not update to include things like bamboo.
It will however be found in any bamboo jungles found outside the current border (within the new border)
Basically, everything on the other side of the existing border will be 1.14 terrain. Beautiful, unexplored land, filled with the many marvellous things that 1.14 has brought us, like pillaged outposts, berry bushes, pandas, and yes, bamboo.
I hope this has answered your question.