If you create a font with a rotation transform (not a transform on the graphics)
and then call Font.layoutGlyphVector(..) the result is drawn horizontally - losing the rotation of the baseline, even though the glyph images are rotated.
A test program demonstrating this is provided and shows that it does not
affect TextLayout - only - a directly laid out GlyphVector.
I think this is due to the different expectations of the two APIs as to the result of native layout.
Also this occurs starting with JDK 9 and works fine in that release if I specify -Dsun.font.layoutengine=icu, so is a regression in the harfbuzz code.

A minor note : the test program also failed on 8u on macos .. but worked (with ICU) on 9 so there was presumably a different macos bug fixed in 9.

Also, another note: I discovered this issue whilst testing a fix for
https://bugs.openjdk.java.net/browse/JDK-8224109