Hello, so I just created a Circle of Spores druid and added the Moon Sickle item, which gives a +1 bonus to spell attack rolls for druid spells. It reflected correctly for all spells, all but Chill Touch which is not a druid spell by default, but it's included as a Druid Circle feature, so I reckon it should count as a druid spells in this case. 

So, not sure if it's an edge case bug or if it's intended to work that way, but appreciate some feedback.

It’s a system limitation, you’ll have to adjust that spell manually.