Darius hemorrhage stacks applying incorrectly.

I played a game of pantheon top recently against Darius. I figured that since I could block two of his hemorrhage stacks it would be more difficult for him to get max stacks and wreck me. Plus Panth has decent poke and high movespeed making it fairly easy to work around Darius' apprehend. However, the first time he all in-ed me, I noticed he hit 5 stacks quite quickly and was surprised by it. The next time I paid more attention to the hemorrhage stacks and noticed that even though I was blocking two of his autos, the hemorrhage stacks were still applying. This allowed Darius to instantly get max damage ultimates off on me regardless of how well I played the fight. I used to play a lot of Darius and I remember when the block and blind mechanics were updated that I could not stack bleeds on Jax or Teemo when those conditions were applied to me as Darius. Since Panth block is meant to function the same way (albeit for only one instance) as those effects, I can't help but think this is a bug. Hopefully this is a helpful report, thank you for your time.