Valve released for Dota 2 patch 7.23a

In addition to changing and removing some items, some heroes once again succumbed to balancing on the part of the developers.

Major changes in patch 7.23a:

• Now, for every rank of a neutral item, more than three things cannot fall
• When in time the category of things will move to a new level, objects of previous ranks will still be able to drop. For example, if earlier from 15 to 25 minutes a player could receive only items of the second category, now there is a chance of falling out of both the second and first categories. However, pre-presets of higher levels will be considered first. The minutes that determine the rank of things were not changed: 5-15 minutes - 1 category, 15-25 minutes - 2 categories, 25-40 - 3 categories, 40-70 - 4 categories, 70+ minutes - 5 categories.
• The drop chance of neutral items has been changed from 10/5 / 2.5 / 1.25 to 9/6/3

You can read the full list of changes in the new patch on the official website.