When I have an item in my hands, such as a gun that is set on my item wheel, when I put the gun away and then try to pull out for example.. a knife, there is a delay in between putting away and pulling out items. I'm not sure if this is intentional or not but it's caused some issues when trying to swap guns in a firefight or when I want to pull out a weapon to deal with a zombie. I always have to wait a second or two before trying to pull out an item from the item-wheel when putting away a different item via the item wheel. There's also another one for bandages where you can pull them out via item wheel, but they won't go back into your inventory via item wheel. You have to manually go into your inventory to put it away.
I've run into the delay issue on both stable and experimental servers whereas the bandage issue seems to only be on experimental servers. I have never had this issue before and it has always been smooth until the 1.27 update