Index Creation time META().xxx is not working in array collection

INSERT INTO default VALUES("k01",{"id":1 , "o1" : {"ch":["a","b"] }});

CREATE INDEX ix20 ON default( ARRAY META().id FOR v IN o1.ch END);  

Above index has no entries in array

[] is indexed instead of ["k01,"k01"]

CREATE INDEX ix21 ON default( DISTINCT ARRAY META().id FOR v IN o1.ch END);  

SELECT META().id FROM default WHERE ANY v IN o1.ch SATISFIES meta().id = "k01" END;

Should  use ix21 and return "k0"

CREATE INDEX ix20 ON default( ARRAY id FOR v IN o1.ch END);  

indexes [1,1]