How could I make my biosphere datapack copy the right terrain?

Hello everyone! So I wanted to make a datapack that would make biospheres a thing again but more varied (if anyone remembers that old mod). I started making it by making a dimension that only generates structures that consist of two armorstands, one is teleported to the overworld and is used to load a glass sphere using a structure block to encase a piece of the terrain. Then that glass sphere is saved via a structure block and then loaded in the empty dimension, resulting in a floating glass sphere that has stuff inside it. The problem is when I got this to work the most of the time the spheres had the same piece of terrain. Probably because all the armor stands were named the same (one was call something like marker, the other sphere_maker, since they were generated by structures, and there was no way to differentiate between the pairs). I also did everything that was needed to make the thing work (I forceloaded and unloaded chunks, I killed the armor_stand after use, etc.), it was working but not well. Dos anyone have any idea about how could I make this datapack work? There must be something that I didn't think about.