Does not affect 6.2.0.CR2 but does affect the latest snapshot.
Will comment with a reproducer.
Stacktrace:
java.lang.AssertionError
at org.hibernate.sql.results.internal.StandardEntityGraphTraversalStateImpl.traverse(StandardEntityGraphTraversalStateImpl.java:84)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.createFetch(BaseSqmToSqlAstConverter.java:7211)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitIdentifierFetch(BaseSqmToSqlAstConverter.java:7165)
at org.hibernate.sql.results.graph.entity.AbstractEntityResultGraphNode.afterInitialize(AbstractEntityResultGraphNode.java:63)
at org.hibernate.persister.entity.AbstractEntityPersister.createDomainResult(AbstractEntityPersister.java:1211)
at org.hibernate.query.sqm.sql.internal.AbstractSqmPathInterpretation.createDomainResult(AbstractSqmPathInterpretation.java:55)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.lambda$visitSelection$23(BaseSqmToSqlAstConverter.java:2267)
at java.base/java.util.Collections$SingletonList.forEach(Collections.java:4966)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitSelection(BaseSqmToSqlAstConverter.java:2262)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitSelectClause(BaseSqmToSqlAstConverter.java:2180)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitQuerySpec(BaseSqmToSqlAstConverter.java:2048)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitQuerySpec(BaseSqmToSqlAstConverter.java:425)
at org.hibernate.query.sqm.tree.select.SqmQuerySpec.accept(SqmQuerySpec.java:122)
at org.hibernate.query.sqm.spi.BaseSemanticQueryWalker.visitQueryPart(BaseSemanticQueryWalker.java:226)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitQueryPart(BaseSqmToSqlAstConverter.java:1908)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitSelectStatement(BaseSqmToSqlAstConverter.java:1593)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.visitSelectStatement(BaseSqmToSqlAstConverter.java:425)
at org.hibernate.query.sqm.tree.select.SqmSelectStatement.accept(SqmSelectStatement.java:222)
at org.hibernate.query.sqm.sql.BaseSqmToSqlAstConverter.translate(BaseSqmToSqlAstConverter.java:756)
at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.buildCacheableSqmInterpretation(ConcreteSqmSelectQueryPlan.java:370)
at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.withCacheableSqmInterpretation(ConcreteSqmSelectQueryPlan.java:290)
at org.hibernate.query.sqm.internal.ConcreteSqmSelectQueryPlan.performList(ConcreteSqmSelectQueryPlan.java:266)
at org.hibernate.query.sqm.internal.QuerySqmImpl.doList(QuerySqmImpl.java:519)
at org.hibernate.query.spi.AbstractSelectionQuery.list(AbstractSelectionQuery.java:367)
at org.hibernate.query.sqm.internal.QuerySqmImpl.list(QuerySqmImpl.java:1079)