Unfortunately, if you upgrade the tower's quality, it will no longer prioritize attracting lightning...

Thanks for the report — i tested this extensively, in the editor and in a normal game, and the tower works as intended.

In the natural storm: bolts are spread over a wide area, so many of them strike outside the tower's range and are caught by other lightning rods nearby. The tower's priority only decides who gets a bolt among the attractors that cover the strike point — it cannot pull in a bolt that falls beyond its reach, no matter how high the priority is.

The test also showed the opposite case: a legendary tower, with its much larger range, catches nearly every natural bolt around it. That confirms the tower's higher priority still applies at quality — the range is what changes, not the priority.

If you give me a screenshot or a description of your setup, I can try to reproduce the problem.
Until then, I can't identify any errors.

Here is the screenshot.
https://imgur.com/a/3wKKoCW

I have mods installed that expand agriculture and quality—could those be the cause?

Thank you for the screenshot. I found the cause:

The "More Quality Scaling" Mod makes a separate copy of every agricultural tower prototype for each quality and swaps the tower you place for that copy. The Fulgural Tower got caught by this, and the copy never received the hidden attractor that gives the tower its lightning priority. So the tower kept planting, the field never ripened, and the bolts went to the Storm Ionizer instead — exactly what your screenshot shows. A normal-quality tower was unaffected, which is why it only appeared after upgrading.

Version 0.14.3 fixes it: the tower is now excluded from that mod's cloning, using the blacklist interface it provides for this. The trade-off is that its bonuses no longer reach the tower either — crane speed and planting range stays the same at every quality. There is no way to have both, since those bonuses only exist on the copy that broke the lightning.

One thing to note: quality towers you have already placed are still copies. Pick them up and place them again after updating.

Thank you! It’s one of my absolute favorite mods that I’ve discovered recently, so I’m really happy. I hope more people get to know about it...

Thank you very much, and have a great time playing the game