Hi,
I know that back in August 2021 there was an issue with rune effects not showing in the HUD. But after thorough tests, I found out that the Chained Fury Rune (+Attack on Hit) does not work as it is supposed to. Not only does it not show up in the HUD, it also has no effect.
I only equipped a dagger with the Chained Fury Rune, nothing else and started fighting enemies. The icon does not show up in the HUD and checking my hero stats after striking an enemy, the Attack-Value does not change one bit (it should at least increase by 1.5). Same goes for bearded axe with the same perk (Hoursecarl's Axe)