FULL PRODUCT VERSION :
java version "9.0.4"
Java(TM) SE Runtime Environment (build 9.0.4+11)
Java HotSpot(TM) 64-Bit Server VM (build 9.0.4+11, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
TreeView arrow does not rotate back when collapsed

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create TreeView with root and children.
Click an item with children to expand - the arrow rotates 90
Click the item to collapse - the arrow stays rotated 90.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The arrow should rotate back when an item is collapsed.
ACTUAL -
the arrow stays rotated 90

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
add to CSS

.tree-cell:collapsed > .tree-disclosure-node > .arrow,
.tree-table-row-cell:collapsed > .tree-disclosure-node > .arrow {
    -fx-rotate: 0;
}