I’ve added some logging to my nodes and now I see that pieces uploaded with TTL=30 days (I presume: test traffic) have a fixed order size of 2319360 bytes, even if the piece itself is 2048 bytes. This is worrying, as this would make traffic accounting in 1.104.5 nodes way off. This is exactly the part of my patch that I wanted to investigate before making a pull request.
At least the patch was reverted later, so up to date nodes will again have the right numbers.