Text.horizontalAlignment is sometimes ignored

In certain case setting any alignment for Text.horizontalAlignment is ignored and it default to Text.AlignLeft.

I could reproduce only with a test (attached) when a Loader is involved, simply putting it in a Row works as expected.
Click on the window to switch between the horizontal or vertical layout. In horizontal layout the multiline text should be horizontally aligned.

The problem depends on width of the text component:
1) if width is a fixed number, it works
2) if width is bound to implicitWidth, it doesn't work (I expect this to be the same as case 3)
3) if width is bound to undefined, it works
4) if width is bound to implicitWidth minus some value, it works
5) if width is bound to implicitWidth plus some value, the text is horizontally aligned, but the whole text content is shifted to the left