In r229 there is better support for high-DPI displays. I assume you are using a text size greater than 100%? If so, then the editor will step up to the next size icon. It supports icons at 16px, 32px and 64px, and chooses the most appropriate size for the display. For example by default it will use 32px, but at 2x display it will use 64px.
So as of r229 the better high-DPI support means on a high-DPI display there are more cases it will pick a higher-resolution 64px icon rather than the 32px icon. So previously it would re-use the 32px icon and never create a 64px icon, but now it creates lots more 64px icons, and gets closer to the 10000 GDI object limit which has been such a pain...
So since this is a Windows limit there's nothing you can do other than use the new workaround to disable unique icons completely.
If you have a low-DPI display then there shouldn't be anything different, but I assume it is that, so let me know if not.