By the way, this happens because many items, especially buildings, does not have alternative recipes. Since the generated recipe‑signal icons are identical to the item‑signal icon, it frequently causes, for example, when setting an item count less than a threshold, you may mistakenly pick the recipe signal instead of the item signal.
I have realized that among two signals sharing the same icon, the first one is usually the item signal and the second is the recipe signal. This greatly lowers the chance of wrong selection. Even so, it would still be very helpful if we could either filter out unnecessary recipes, or add a small badge to newly‑added recipe‑signal icons so they can be easily visually distinguished from original item icons.