Level Streaming - specific question

I’m about to create level streams that will essentially create a grid covering my entire map. My question has to do with level streams that may overlap. My level designer places forest into the level in large segments. If one forest is placed and it covers two or more level streams will it be proprietary to the level stream it was paced in initially or will it be segmented? Would a tree/boulder/grass patch/shrub that falls on the dividing line separating the level streams be cleaved in half?

Objects won’t be cleaved in half, but generators would need to be individual per level I believe otherwise when one unloads from streaming, it will take its generated objects with it.