I looked to see if there was a bug report thread before I decided to write this post, but I did not see any that were open for me to share the bugs I've found so far. I only have 2 to report, but I figured I should report them sooner than later so that they can hopefully make it into a future patch. They are:
Infinite rune gifts
I'm using Ubisoft+, so I have the the Ultimate Edition of the game that gifts me runes, among other things. I am being gifted the same runes pretty much every time I start the game, to the point where I have multiple copies of each so far. I am able to place the copies into any weapon or armor piece I want, but I noticed that when I hover over each copy, they say that they are slotted into the first item I placed the original in. So even though I have a copy placed in my two-handed axe, it still says it's slotted into the original one handed axe. Therefore, I'm not sure if the bug is allowing major benefits.
Ultra-sensitive photo mode UI
Trying to choose a specific option while editing a photo is a real hassle. Pressing W or S to go up or down in the edit mode options sends the selection flying. Just a quick tap will move the selection by 3 or 4 places, so if I want to go from temperature to tint, for example, I have to do a medium tap, so the selection moves 4 - 6 places, then do a quick tap or two to hopefully land on it. The sensitivity for the button presses needs to be turned way down for photo mode.
That's all I have for now. I'll report anything else I find to help out with polishing the game. I was really looking forward to this Assassin's Creed more so than any of the more recent ones, and I am really happy with how it turned out.