A lot of java/lang/String/CompactString/ tests fail with
Thread[JVMCI CompilerThread3,9,system]: Compilation of java.util.Formatter$FormatSpecifier.print(Object, Locale) failed:
org.graalvm.compiler.debug.GraalError: failed guarantee: no FrameState at DeoptimizingNode 365|Deopt
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.debug.GraalError.guarantee(GraalError.java:86)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.common.FrameStateAssignmentPhase$FrameStateAssignmentClosure.processNode(FrameStateAssignmentPhase.java:69)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.common.FrameStateAssignmentPhase$FrameStateAssignmentClosure.processNode(FrameStateAssignmentPhase.java:61)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.graph.ReentrantNodeIterator.apply(ReentrantNodeIterator.java:125)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.graph.ReentrantNodeIterator.apply(ReentrantNodeIterator.java:102)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.common.FrameStateAssignmentPhase.run(FrameStateAssignmentPhase.java:127)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.Phase.run(Phase.java:49)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.BasePhase.apply(BasePhase.java:197)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.BasePhase.apply(BasePhase.java:139)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.PhaseSuite.run(PhaseSuite.java:212)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.BasePhase.apply(BasePhase.java:197)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.phases.BasePhase.apply(BasePhase.java:139)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.core.GraalCompiler.emitFrontEnd(GraalCompiler.java:225)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.core.GraalCompiler.compile(GraalCompiler.java:144)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.core.GraalCompiler.compileGraph(GraalCompiler.java:129)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.hotspot.HotSpotGraalCompiler.compileHelper(HotSpotGraalCompiler.java:185)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.hotspot.HotSpotGraalCompiler.compile(HotSpotGraalCompiler.java:198)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.hotspot.CompilationTask$HotSpotCompilationWrapper.performCompilation(CompilationTask.java:190)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.hotspot.CompilationTask$HotSpotCompilationWrapper.performCompilation(CompilationTask.java:98)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.core.CompilationWrapper.run(CompilationWrapper.java:177)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.hotspot.CompilationTask.runCompilation(CompilationTask.java:339)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.hotspot.HotSpotGraalCompiler.compileMethod(HotSpotGraalCompiler.java:138)
        at jdk.internal.vm.compiler@13-internal/org.graalvm.compiler.hotspot.HotSpotGraalCompiler.compileMethod(HotSpotGraalCompiler.java:105)
        at jdk.internal.vm.ci/jdk.vm.ci.hotspot.HotSpotJVMCIRuntime.compileMethod(HotSpotJVMCIRuntime.java:524)


when running in Graal as JIT mode and -Xcomp.
All failures seems to be when tests are run with -XX:-CompactStrings flag.

Was not able to reproduce without "-Xcomp" flag.