Were you playing on PC? What's your rig? Mine runs Doom Eternal (I know it's super optimized, but still) and Sekiro pretty much flawlessly, so clearly something is off.
One bug I had that really pissed me off was when, after killing an enemy on a narrow ledge, the ragdolls (?) started to glitch my own character's animations (??), my character started jittering weirdly and fell off, and the fall damage killed me. I struggle to explain it, but I'm pretty sure that enemy ragdolls shouldn't push off the player, especially since that "push" animation was clearly completely buggy.
Another glitch I've had, repeatedly, is how after getting my "bloodstain" back, the "HP restored" message appears... like a full minute later? I was so confused the first time it happened, because I was at half HP and the game told me my HP had been restored and I didn't know why. It happened several more times, until it dawned on me that it's the bloodstain retrieval message, but just super laggy.
I also feel like there's either input lag or unresponsive controls at times. Take the dodge for example, its animation is fast and the distance is long, but it feels oddly delayed from the button press. I dunno, something about it is... off
