Some Plasma styles started to make task manager icons very small

Using Arch Linux and latest available for it Plasma.

For some reason now when I apply a Win7-like Plasma style my task manager icons become very small:

Styles tested: Se7en Aero Style; Expose Air; ExposeAirTweakedBlue; ExposeAirTweakedGrey.

With Breeze it looks normal (can’t embed more than 1 image since I’m a new user).

What’s weird is that it didn’t happen about a month ago. Did a Plasma update cause this? Did I mess up a setting and forget about it? How can I fix this? Thanks.