Sankey Chart is showing blank stripe for some column

Just like I described in title, Sankey chart could show just blank(white) stripe for some data

here is a example table 

Create table abc(a string, b string, c string, d string, e string);

insert into abc values('a1', 'b1', 'c1', 'd1', 'e1');

insert into abc values('a1', 'b1', 'c1', 'd1', 'e1');

insert into abc values('a2', 'b1', 'c1', 'd1', 'e1');

insert into abc values('a3', 'b2', 'c1', 'd2', 'e2');

insert into abc values('a4', 'b1', 'c1', 'd1', 'e1');

insert into abc values('a4', 'b2', 'c1', 'd2', 'e2');

Here is Sankey chart of all data and counts in looker 

ff30ff8c-951f-480b-9e4d-cc8d34e199f7.png
0 0 256
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