I found a semi-progress blocking bug during Aria's quest line - you can't fix the telescope yourself, I think it's something with the quest progress variable, the event with the telescope seems to behave as if it's fixed already directly after you start the quest. I can give her the Lens directly, but the reward difference makes this sub-optimal.
Another potential bug - Crimson Sand recipe doesn't actually get added, unless it's a recipe above level 3 Alchemy. Lens also don't seem to be craftable on level 3 Artificing, I don't know if it requires level 4 (found mine in a satchel item).