Jaime Fernando Echeverría Pinto

Unfortunately this affects maps currently on the marketplace by reducing interactivity of items that use interactions while shifting and holding items. They're not always crucial mechanics but they do exist

Obviously I'm currently in agreement with most of the people here. Taking the item in hand situation into account would take me ages. But at the very least I can say something about the head situation. I'm sure you're aware of the recent popularity of command block based mechanisms that have been utilizing armorstands to the extreme of their capacities.
As it turns out some of these are very specific in their placement and the changing of certain values on the heads for items might mess up many of them. But that aside, I took the time to see what the differences were in items that were considered viable in the previous update to be worn on heads. For the most part I have issue with it. You fixed one issue with an axis offset that was out of place, however I'm confused as to why you decided to change the offset of the items like this. I am thoroughly unconvinced at the moment that the changes done to armorstand head offset was fully intentional, and instead believe it was a side effect of the changes done to mobs and armor wearing things.
In my first picture is all the blocks and "block items" (without 3D rendering in hand) placed on zombies and armorstands respectively, with one item that it held in hand differently (blaze rod) and a regular item (diamond) to observe any other possible adverse affects these changes may have made without obvious outcomes. Some are clearly missing simply because some are just very similar or simply have different data values.
The reason I am unconvinced this was intentional for armorstands is the following: In my first and second images of close up zombies, you can observe the new End Rod item placed on their heads, clearly a cute reference to a unicorn mob. Which I approve of, it's hilarious. The other close up shows something similar with fence gates, possibly a Lone Ranger idea for darker types of wood, which I also approve of.
I do NOT approve of the imaged 4 and 5 of close up armorstands. If the changes done to the heads of armorstands was truly intentional, then you must've intended for this strange, VERY custom offset in a strange angular way specifically for armorstands as well, and this was NOT a side effect of just having a little fun for the mobs themselves. This, along with the claim that this is a result of banner placement on the armorstand heads allows me to conclude that due to time constraints and deadlines and workload these changes were missed or ignored as part of the process as to see what mattered most and what had most priority. Because if this were truly only because of banners, then why does it need to affect all items, yet not blocks or these two very special cases? Banners on armorstands already look strange, but these special cases simply cannot allow me to believe that this was actually intentional, and insist that this wasn't truly the intention for armorstands, only for mobs. I hope to see this issue as at least "to be resolved" because I am still not convinced it was all intentional.

~RPGgrenade