Whatever Happened to Bonds Being Data Dependent?

Bonds began the day in stronger territory and remained stronger through mid-day despite AM volatility.  Some of the volatility was driven by economic data with S&P Global Services PMI coming in higher than expected.  Most of the day's movement, however, was driven by "something else," and something else pushed longer term yields higher while allowing short term yields to remain lower.  How do we reconcile that in this era where "data dependence" is so often repeated as the bond market's prime directive?  First off, while today's volatility was unpleasant in the afternoon, it was very small in the bigger picture.  It was also not so much about bond market weakness as it was about the yield curve normalizing.  This is not a phenomenon that will always need to play out at the expense of the 10yr and MBS.  That's just the way it played out today.