NullPointerException during copy/paste of Java 12 code (in the attached project)

I got the exception below in a fresh installation of Netbeans 11.1.  This is after I installed nb-javac 1.6, but zero other plugins.  I'm using Gradle 5.5 on Windows 10, but that probably makes no difference here.  Netbeans is running on OpenJDK 12 and the project is also being built using Java 12.

The bug can be reproduced using the attached small project, which I painstakingly distilled out from a large code base where this bug was first found. To trigger the exception, you need to copy "CopyMe" from Source.java and paste it into Destination.java.  Upon pasting, the "Import Classes" dialog will appear.  Immediately after pressing the "OK" button, this exception happens:

java.lang.NullPointerExceptionjava.lang.NullPointerException at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:334) at org.netbeans.lib.nbjavac.services.NBResolve.isAccessible(NBResolve.java:72) at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:379) at com.sun.tools.javac.comp.Resolve.isAccessible(Resolve.java:441) at org.netbeans.lib.nbjavac.services.NBResolve.isAccessible(NBResolve.java:66) at com.sun.tools.javac.api.JavacTrees.isAccessible(JavacTrees.java:913) at org.netbeans.api.java.source.GeneratorUtilities.getImportedElement(GeneratorUtilities.java:1826) at org.netbeans.api.java.source.GeneratorUtilities.addImports(GeneratorUtilities.java:1173) at org.netbeans.api.java.source.SourceUtils.resolveImport(SourceUtils.java:403) at org.netbeans.modules.java.editor.imports.ClipboardHandler$1.run(ClipboardHandler.java:154) at org.netbeans.modules.java.editor.imports.ClipboardHandler$1.run(ClipboardHandler.java:126) at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:673) at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:663) at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:502) at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:586) at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:130) at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:114) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:181) at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:178) at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:153) at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:335) at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:118) at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:67) at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:178) at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:81) at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:452) at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:423) at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:684) at org.netbeans.modules.java.editor.imports.ClipboardHandler.doImport(ClipboardHandler.java:126) at org.netbeans.modules.java.editor.imports.ClipboardHandler.access$100(ClipboardHandler.java:113) at org.netbeans.modules.java.editor.imports.ClipboardHandler$4$1.run(ClipboardHandler.java:216) at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1418) at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:45) at org.openide.util.lookup.Lookups.executeWith(Lookups.java:278)[catch] at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2033)