One-2-One mapping in MongoDB should not require PK on child table

CREATE FOREIGN TABLE  Customer (
    CustomerId integer PRIMARY KEY,
    FirstName varchar(25),
    LastName varchar(25),
) OPTIONS(UPDATABLE 'TRUE');
 
CREATE FOREIGN TABLE Address (
    CustomerId integer,
    Street varchar(50),
    City varchar(25),
    State varchar(25),
    Zipcode varchar(6),
    FOREIGN KEY (CustomerId) REFERENCES Customer (CustomerId),
 ) OPTIONS(UPDATABLE 'TRUE', teiid_mongo:MERGE 'Customer');

insert into Customer (customer_id ,first_name,last_name) values ('1002','Syed','Iqbal');

insert into Address (customer_id,street,city,state,zipcode) values ('1002','123 Main St','Chicago','IL','60659');

09:38:53,250 ERROR [org.teiid.CONNECTOR] (Worker1_QueryProcessorQueue11) 70p5084MEtHx Connector worker process failed for atomic-request=70p5084MEtHx.0.0.3: java.lang.NullPointerException
	at org.teiid.translator.mongodb.MongoDocument.buildMergeKey(MongoDocument.java:252)
	at org.teiid.translator.mongodb.MongoDocument.build(MongoDocument.java:143)
	at org.teiid.translator.mongodb.MongoDocument.<init>(MongoDocument.java:64)
	at org.teiid.translator.mongodb.MongoDBSelectVisitor.visit(MongoDBSelectVisitor.java:400)
	at org.teiid.language.NamedTable.acceptVisitor(NamedTable.java:66) [teiid-api-8.7.0.Alpha2-SNAPSHOT.jar:8.7.0.Alpha2-SNAPSHOT]
	at org.teiid.language.visitor.AbstractLanguageVisitor.visitNode(AbstractLanguageVisitor.java:51) [teiid-api-8.7.0.Alpha2-SNAPSHOT.jar:8.7.0.Alpha2-SNAPSHOT]
	at org.teiid.translator.mongodb.MongoDBSelectVisitor.append(MongoDBSelectVisitor.java:95)
	at org.teiid.translator.mongodb.MongoDBUpdateVisitor.visit(MongoDBUpdateVisitor.java:59)
	at org.teiid.language.Insert.acceptVisitor(Insert.java:57) [teiid-api-8.7.0.Alpha2-SNAPSHOT.jar:8.7.0.Alpha2-SNAPSHOT]