REGRESSION: Test started to throw AssignToBoundException

There is a test example running ok on SoMa TV b22 (#275) and not starting, throwing AssignToBoundException on SoMa TV b23 (#284)

Stacktrace is following

Unexpected exception: com.sun.javafx.runtime.AssignToBoundException: Cannot assign to bound variable
com.sun.javafx.runtime.AssignToBoundException: Cannot assign to bound variable
        at com.sun.javafx.runtime.FXBase.restrictSet$(FXBase.java:147)
        at com.sun.javafx.runtime.FXBase.restrictSet$(FXBase.java:142)
        at graphics.api.control.scrollview.ScrollViewTest_10$1Local$3$1ScrollView$ObjLit$1.set$hBlockIncrement(ScrollViewTest_10.fx:52)
        at com.sun.javafx.scene.control.skin.ScrollViewSkin.setHBlockIncrement(ScrollViewSkin.fx:461)
        at com.sun.javafx.scene.control.skin.ScrollViewSkin.onReplace$hUnitIncrement(ScrollViewSkin.fx:228)
        at com.sun.javafx.scene.control.skin.ScrollViewSkin.get$hUnitIncrement(ScrollViewSkin.fx:40)
        at com.sun.javafx.scene.control.skin.ScrollViewSkin.invalidate$hUnitIncrement(ScrollViewSkin.fx:40)
        at com.sun.javafx.scene.control.skin.ScrollViewSkin.invalidate$ScrollViewSkin$scroll(ScrollViewSkin.fx:40)
        at com.sun.javafx.scene.control.skin.ScrollViewSkin.invalidate$control(ScrollViewSkin.fx:40)
        at com.sun.javafx.scene.control.skin.SkinBase.set$control(SkinBase.fx:31)
        at com.sun.javafx.scene.control.skin.SkinAdapter.setControl(SkinAdapter.fx:31)
        at javafx.scene.control.Control.onReplace$skin(Control.fx:85)
        at javafx.scene.control.Control.set$skin(Control.fx:63)
        at javafx.scene.control.Control.userInit$(Control.fx:120)
        at com.sun.javafx.runtime.FXBase.complete$(FXBase.java:271)
        at graphics.api.control.scrollview.ScrollViewTest_10$1Local$3.applyDefaults$(ScrollViewTest_10.fx:52)
        at graphics.api.control.scrollview.ScrollViewTest_10$1Local$3.doit$$2(ScrollViewTest_10.fx:52)
        at graphics.api.control.scrollview.ScrollViewTest_10.run(ScrollViewTest_10.fx:63)
        at com.sun.export.Runner$1Local$1.doit$$0(Runner.fx:20)
        at com.sun.export.Runner.javafx$run$(Runner.fx:27)
        at com.sun.javafx.runtime.provider.GUIRuntimeProvider$1.run(GUIRuntimeProvider.java:73)
        at com.sun.javafx.tk.prism.PrismToolkit$1Runnable$ObjLit$4.run(PrismToolkit.fx:193)
        at java.lang.Thread.run(Thread.java:1007)
        at java.lang.Thread.startup(Thread.java:1084)

See example in attachment