ADDITIONAL SYSTEM INFORMATION :
Any System, JavaFX 20-ea+6

A DESCRIPTION OF THE PROBLEM :
It is a common issue: https://stackoverflow.com/questions/32151435/javafx-duplicate-series-added

If you try to change the chart series when animation is on, you get this error

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create a LineChart with multiple series
2. remove some series and re-add them

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
1. Nothing really, unless the series you added are different in which case the chart would change
ACTUAL -
e=java.lang.IllegalArgumentException: Duplicate series added
stacktrace(len=14):
javafx.scene.chart.XYChart.lambda$new$1(XYChart.java:135)
com.sun.javafx.collections.ListListenerHelper$Generic.fireValueChangedEvent(ListListenerHelper.java:329)
com.sun.javafx.collections.ListListenerHelper.fireValueChangedEvent(ListListenerHelper.java:73)
javafx.collections.ObservableListBase.fireChange(ObservableListBase.java:239)
javafx.collections.ListChangeBuilder.commit(ListChangeBuilder.java:482)
javafx.collections.ListChangeBuilder.endChange(ListChangeBuilder.java:541)
javafx.collections.ObservableListBase.endChange(ObservableListBase.java:211)
javafx.collections.ModifiableObservableListBase.add(ModifiableObservableListBase.java:162)
java.base/java.util.AbstractList.add(AbstractList.java:111)

CUSTOMER SUBMITTED WORKAROUND :
Turn animation off

FREQUENCY : always