The last couple 20Y auctions have been weaker than 10s and 30s so it makes sense they'd target them. We're in the phase of interest expense management where Treasury is trying every non-crisis tool in the toolbox to massage long yields without imposing a cap. One can see how this path ultimately leads to the Fed being stripped of its autonomy by the necessities of the moment and becoming a vassal institution to Treasury needs. Time is a flat circle.