Yeah you are right. Only the UP and UP has hive and there are not enough hive. I got five and was at the end so I went back to orbit before I finished the adventure so I could start over and get enough hive samples. Hope this helps others.
You can do the forest since it's on Mercury even if it starts in the tower, that is how I got them....
Verdant Forest works for it, it seems, luckily. Finished off my samples there.
Up and up has Hive? I'll have to see and hope it drops something. Did the Bug in the System with waves of adds and only got four. Took me like 45minutes of free roam and the Garden World with constant kills to get the nine Cabal samples. If the drop rate is like 1%(which is what it feels like), I don't know if I have the time or ability to complete the invitation this week, which I'm already a week behind on. I swear, if I'm screwed over this week by their nonsense rng, I'm just calling it quits. I refuse to be set back two weeks. Might as well just stick to watching what the lore is on Youtube or something at that point since powerful drops still don't even really function in a reasonable manner. Oh well.