Playing .25k version as the balseraph,
I have incense with a plantation connected to my trade network, however I don't see it in my connected ressources in city screen. Temple do not provide +1 happy. Seems like a bug to me unless balseraph has some funky ability I never saw before
unlisted requirement, you must have philosophy researched first before incense has any effect. atleast, thats what was wrong with mine.
That said, alot of such requirements are missing from documentation, making game play very confusing. no mention of swordsmen needing a barracks, incense needing philosophy, or atleast not mentioned where i looked.
edit in response to nikis-night, to avoid cluttering the thread.
slight problem, while the philosophy requirement is there initially for mouse over when looking at incense, it goes away once the plantation is built, so if you think you know how things work, i.e from previous versions or just intuitively from the vanilla game, and build the plantation without looking, you are left scratching your head. and its not intuitive.(i can see it and build the structure before i can use... non intuitive), and its not listed in the technology tree as a benefit of getting philosophy, so its very, very confusing, even to long term players, while atleast with the baracks/swordsmen thing, long term players can probably remember it being a requirement.
also bear in mind that these are just the two i remember initially. i recall encountering several.