Test case:

var m = new javax.script.ScriptEngineManager();
var e = m.getEngineByName('js');

e.eval('function f(e){ eval("e") } f()');
e.eval('function f(){ var e = 33; eval("e") } f()')

The above throws Exception in thread "main" java.lang.ClassCastException: Cannot cast jdk.nashorn.internal.scripts.JO2P0 to jdk.nashorn.internal.scripts.JO1P1
at sun.invoke.util.ValueConversions.newClassCastException(ValueConversions.java:461)
at sun.invoke.util.ValueConversions.castReference(ValueConversions.java:456)
at jdk.nashorn.internal.scripts.Script$\^eval\_#1\^eval\_.runScript(<eval>#1<eval>:1)