It's perfectly logical, but in my opinion not a great "feature" that Reaper behaves this way.
You know how every channel in a folder is technically routing itself to the 1/2 of the Folder instead of Master? Well that goes for sidechains 3/4, 5/6, everything. It all gets sent to 1/2, 3/4...of the parent, so yeah you'll see sidechain activity on the parent.
What I dislike about this is that if you want to send stuff to 3/4 of child tracks then it sort of screws you over if you want to use 3/4 on the Folder itself because it'll be a collection of all the 3/4s of the children. In this case I just use 5/6 on the Folder instead, and problem solved...but starts getting messy.
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