Animation interpolation takes shorter time than expected

When using following timeline, the rotation takes about 1sec (instead of 5). If I use label.rotate => 0 or don't use the frame at 0 sec at all it works correctly. This is a blocker for the JavaFX Composer since we use the animation to get from any state of UI (I mean the label.rotate property can have whatever value) to a particular state. The same animation shall be used multiple times. The code code below has been suggested as a workaround in RT-6759 but apparently it doesn't work.

                javafx.animation.Timeline {
                    keyFrames: [
                        javafx.animation.KeyFrame {
                            time: 0s
                            values: [
                                label.rotate => label.rotate tween javafx.animation.Interpolator.DISCRETE,
                            ]
                        }
                          javafx.animation.KeyFrame {
                            time: 5000ms
                            values: [
                                label.rotate => 180 tween javafx.animation.Interpolator.LINEAR,
                            ]
                            action: function() {
                                button.disable = false;
                                button2.disable = false;
                            }
                        }
                    ]
                }