Attempt to access property/element of a Java method results in AssertionError: unknown call type

Expected: Java method objects don't have properties/elements.
Unexpected: any attempt to access them crashes the program with an AssertionError, e.g.:

jjs> java.lang.String.valueOf["(int)"]
Exception in thread "main" java.lang.AssertionError: unknown call type GET:ELEMENT|PROPERTY|METHOD(Object,Object)Object@org.openjdk.nashorn.internal.scripts.Script$\^shell\_/0x0000000800c09c40
        at org.openjdk.nashorn/org.openjdk.nashorn.internal.runtime.linker.NashornBottomLinker.linkBean(NashornBottomLinker.java:124)
        at org.openjdk.nashorn/org.openjdk.nashorn.internal.runtime.linker.NashornBottomLinker.getGuardedInvocation(NashornBottomLinker.java:76)
        at jdk.dynalink/jdk.dynalink.linker.support.CompositeGuardingDynamicLinker.getGuardedInvocation(CompositeGuardingDynamicLinker.java:109)
        at jdk.dynalink/jdk.dynalink.LinkerServicesImpl.lambda$getGuardedInvocation$0(LinkerServicesImpl.java:137)
        at jdk.dynalink/jdk.dynalink.LinkerServicesImpl.getWithLookupInternal(LinkerServicesImpl.java:168)
        at jdk.dynalink/jdk.dynalink.LinkerServicesImpl.getGuardedInvocation(LinkerServicesImpl.java:135)
        at jdk.dynalink/jdk.dynalink.DynamicLinker.relink(DynamicLinker.java:242)
        at org.openjdk.nashorn.scripts/org.openjdk.nashorn.internal.scripts.Script$\^shell\_/0x0000000800c09c40.:program(<shell>:1)

jjs> java.lang.String.valueOf.call
Exception in thread "main" java.lang.AssertionError: unknown call type GET:PROPERTY|ELEMENT|METHOD:call(Object)Object@org.openjdk.nashorn.internal.scripts.Script$\^shell\_/0x0000000800c09c40
        at org.openjdk.nashorn/org.openjdk.nashorn.internal.runtime.linker.NashornBottomLinker.linkBean(NashornBottomLinker.java:124)
        at org.openjdk.nashorn/org.openjdk.nashorn.internal.runtime.linker.NashornBottomLinker.getGuardedInvocation(NashornBottomLinker.java:76)
        at jdk.dynalink/jdk.dynalink.linker.support.CompositeGuardingDynamicLinker.getGuardedInvocation(CompositeGuardingDynamicLinker.java:109)
        at jdk.dynalink/jdk.dynalink.LinkerServicesImpl.lambda$getGuardedInvocation$0(LinkerServicesImpl.java:137)
        at jdk.dynalink/jdk.dynalink.LinkerServicesImpl.getWithLookupInternal(LinkerServicesImpl.java:168)
        at jdk.dynalink/jdk.dynalink.LinkerServicesImpl.getGuardedInvocation(LinkerServicesImpl.java:135)
        at jdk.dynalink/jdk.dynalink.DynamicLinker.relink(DynamicLinker.java:242)