The following pane:

                                pane = PaneBuilder.create()
                                    .layoutX(50)
                                    .layoutY(50)
                                    .prefHeight(100)
                                    .prefWidth(100)
                                    .style("-fx-border-image-source: url(\"JavaFX.png\"); -fx-border-image-width: 20; -fx-border-image-slice: 20; ")
                                    .build(),

Has the following bounds:

pane.getBoundsInLocal() = BoundingBox [minX:-10.0, minY:-10.0, minZ:0.0, width:120.0, height:120.0, depth:0.0, maxX:110.0, maxY:110.0, maxZ:0.0]
pane.getBoundsInParent() = BoundingBox [minX:40.0, minY:40.0, minZ:0.0, width:120.0, height:120.0, depth:0.0, maxX:160.0, maxY:160.0, maxZ:0.0]
pane.getLayoutBounds() = BoundingBox [minX:0.0, minY:0.0, minZ:0.0, width:100.0, height:100.0, depth:0.0, maxX:100.0, maxY:100.0, maxZ:0.0]

The screenshot shows that only layoutBounds are correct. Others include 10 pixels on each side which is incorrect as border is drawn inside the layout bounds.