CheckBox in 4.4

Godot Version

4.4.1

Question

I’ve just migrated my project from 4.2.1 to 4.4.1 and faced the problem regarding CheckBox customization. This is the theme I have:


And here is what I get:

This checkbox is not inside a container, its minimum size is set to zeroes, I’ve shrunk it manually, but it doesn’t get smaller than 14x20. 14 is caused by 1 pixel margin I’ve set, that’s ok, but why isn’t it 14x14? It used to be like that in 4.2.1. It seems like there is some hidden top and bottom margin now.
If I remove the icon, CheckBox can shrink up to 2x2 size. As if the icon size is actually 12x18, but it’s not:

What could be the cause?