submodule test-bug {
  yang-version 1.1;
  belongs-to main-module {
    prefix mm;
  }

  augment "/mm:services" {
    container plan-notifications {
      list subscription {
        key name;
        unique "service-type component-type";
        leaf name {
          type string;
        }
        leaf service-type {
          type string;
        }
        leaf component-type {
          type string;
        }
      }
    }
  }
} 

Unexpected error processing source RevisionSourceIdentifier [name=submodule]. Please file an issue with this model attached.
java.lang.IllegalStateException: Action was not defined yet.
    at com.google.common.base.Preconditions.checkState(Preconditions.java:502)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ModifierImpl.tryApply(ModifierImpl.java:143)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ModifierImpl$PhaseFinished.phaseFinished(ModifierImpl.java:401)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.addPhaseCompletedListener(StatementContextBase.java:699)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ModifierImpl.requiresCtxImpl(ModifierImpl.java:119)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ModifierImpl.requiresCtx(ModifierImpl.java:165)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ModifierImpl.requiresCtx(ModifierImpl.java:41)
    at org.opendaylight.yangtools.yang.parser.rfc7950.stmt.meta.UniqueStatementSupport.onStatementAdded(UniqueStatementSupport.java:91)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementDefinitionContext.onStatementAdded(StatementDefinitionContext.java:67)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ReactorStmtCtx.replicaAsChildOf(ReactorStmtCtx.java:370)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.copyAsChildOfImpl(StatementContextBase.java:755)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.copyAsChildOf(StatementContextBase.java:743)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.copySubstatement(InferredStatementContext.java:586)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.copySubstatement(InferredStatementContext.java:576)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.initializeSubstatements(InferredStatementContext.java:541)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.ensureEffectiveSubstatements(InferredStatementContext.java:478)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.streamEffective(InferredStatementContext.java:503)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.createInferredEffective(InferredStatementContext.java:222)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.tryToReuseSubstatements(InferredStatementContext.java:306)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.tryToReusePrototype(InferredStatementContext.java:239)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.createEffective(InferredStatementContext.java:218)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.createEffective(StatementContextBase.java:439)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ReactorStmtCtx.loadEffective(ReactorStmtCtx.java:389)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ReactorStmtCtx.buildEffective(ReactorStmtCtx.java:385)
    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
    at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
    at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
    at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
    at org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport.buildEffectiveSubstatements(AbstractStatementSupport.java:139)
    at org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport.createEffective(AbstractStatementSupport.java:83)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.AbstractResumedStatement.createEffective(AbstractResumedStatement.java:124)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.AbstractResumedStatement.createInferredEffective(AbstractResumedStatement.java:131)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.createInferredEffective(InferredStatementContext.java:229)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.createInferredEffective(InferredStatementContext.java:222)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.tryToReuseSubstatements(InferredStatementContext.java:306)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.tryToReusePrototype(InferredStatementContext.java:239)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.InferredStatementContext.createEffective(InferredStatementContext.java:218)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.createEffective(StatementContextBase.java:439)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ReactorStmtCtx.loadEffective(ReactorStmtCtx.java:389)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ReactorStmtCtx.buildEffective(ReactorStmtCtx.java:385)
    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
    at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
    at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
    at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
    at org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport.buildEffectiveSubstatements(AbstractStatementSupport.java:139)
    at org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport.createEffective(AbstractStatementSupport.java:83)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.AbstractResumedStatement.createEffective(AbstractResumedStatement.java:124)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.AbstractResumedStatement.createEffective(AbstractResumedStatement.java:109)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.createEffective(StatementContextBase.java:439)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ReactorStmtCtx.loadEffective(ReactorStmtCtx.java:389)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ReactorStmtCtx.buildEffective(ReactorStmtCtx.java:385)
    at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
    at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655)
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
    at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
    at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
    at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
    at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:578)
    at org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport.buildEffectiveSubstatements(AbstractStatementSupport.java:139)
    at org.opendaylight.yangtools.yang.parser.spi.meta.AbstractStatementSupport.createEffective(AbstractStatementSupport.java:83)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.AbstractResumedStatement.createEffective(AbstractResumedStatement.java:124)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.AbstractResumedStatement.createEffective(AbstractResumedStatement.java:109)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.StatementContextBase.createEffective(StatementContextBase.java:439)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ReactorStmtCtx.loadEffective(ReactorStmtCtx.java:389)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.ReactorStmtCtx.buildEffective(ReactorStmtCtx.java:385)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.BuildGlobalContext.transformEffective(BuildGlobalContext.java:261)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.BuildGlobalContext.buildEffective(BuildGlobalContext.java:211)
    at org.opendaylight.yangtools.yang.parser.stmt.reactor.CrossSourceStatementReactor$BuildAction.buildEffective(CrossSourceStatementReactor.java:224)
    at org.opendaylight.yangtools.yang.parser.impl.DefaultYangParser.buildEffectiveModel(DefaultYangParser.java:96)