I can’t exactly replicate your behavior: I get pure ascending order with that query (my filenames do have slightly different date format). What I think is happening, at least for me, is that the groupByFile is default to true for dv.taskListlink to documentation and I don’t see a way to convince that to sort in desc. So instead I set it to false and did my own groupBy, manually sorting the group keys in descending order afterwards. Does this work with your date format?
Well, that’s confusing!
Are you on version 0.5.34 for Dataview? There have been a lot of updates recently. If there was an update, does your original query from the top of the thread produce the same behavior after the update? If you were already on the current version, maybe check out the Issues and Discussions tabs on the dataview GitHub project and see if anyone there has posted anything similar.