Following what is said in the Description of the DTL-4928 you get the repaint issue.
Adding option -Dprism.dirtyopts=false is enough to silence this issue : this is generally the sign something's wrong within FX platform hence this defect.
Be careful that when following steps ofDTL-4928 you must run a SceneBuilder where assertions are enabled: this is the case by default when running SB from a repository but this is not the case if you run SB from a public bundle.
            
Adding option -Dprism.dirtyopts=false is enough to silence this issue : this is generally the sign something's wrong within FX platform hence this defect.
Be careful that when following steps of
- duplicates
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                    JDK-8119448 Light.SPOT/Point: duplicated when moving the mouse -           
- Closed
 
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- relates to
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                    JDK-8088251 Point and Spot lights are not affected by coordinate scaling -           
- Open
 
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