Run the animation or twotextureproviders examples. In animation, choose Animators. Twotextureproviders uses RotationAnimator always so that does not need anything special.

Then resize the window while the content is animating.

With the threaded render loop there is no problem. When switching to 'basic' (or when running on macOS with OpenGL), animators are suddenly broken in combination with window resizing, resulting in a lot of flicker: resizing clearly generates some frames where the animated property is at its initial value.

Happens both with 5.13.0 and the latest 5.14 branch. Have not tried other versions.