I was building a Berserker comp with Olaf as the carry. As you know, Olaf gains AS from his ability, I also had a Rageblade on him. His attack speed stayed static at like 0.8 AS, it would not increase with rageblade passive stacks or increase from his ability. I've noticed this is widespread and has even been happening for Yasuo.
Reproduction of bug:
Pick anybody with attack speed ability / attack speed items
R Click to view stats / open damage dealt
watch as even a 6 stack ranger and triple rage blade vayne only has 0.7 AS
check damage dealt
vayne did minimal damage comparatively to having full benefits