impossible to set descendent order in archive block view

It is impossible to set the order of visualization in the block view as descendent: it will appear set correctly, but it will always remain ascendent, no matter how and how many times you try, doesn't change disabling javascript, refreshing the cache, refreshing all the caches, calling cron. If you export the definition (which is correct already at the time of exporting) and reimport in even under a different name, you get the same error.