Not sure if you're still planning to play or not, but figured I'd let you know that there was indeed a bug with the apple tree, and the fixed version is out now. Sorry for the confusion!
Hm... in that case I'll just quickly hop in, complete the collection, then be on hiatus for the next update (whatever that update may be) I'm too lazy to finish the sciency backpack upgrade since I've already bought every other upgrades there are
