Referencing of outer aliases in subqueries only works for one level

[Mobe91]

In the following query assignedUser.id.userId fails to be resolved:

.from(UserGroup.class, "internalUg")
                .innerJoin("internalUg.connectedUserGroup", "userGroup")
                .innerJoin("userGroup.assignedUsers", "assignedUser")
                .where("owner.id").eq(cocamId)
                .whereNotExists()
                    // https://hibernate.atlassian.net/browse/HHH-9027
                    .from(UserGroup.class, "workaround")
                    .select("1")
                    .where("workaround").eqExpression("internalUg")
                    .whereExists()
                        .from(UserGroupAssigned.class, "ass")
                        .select("1")
                        .where("ass.id.userGroupId").eqExpression("workaround.id")
                        .where("ass.id.userId").eqExpression("assignedUser.id.userId")
                    .end()
                .end()