Incorrect index rowkey generated when updating only non-indexed columns after a delete

The following steps result in an incorrect index rowkey being generated after an index update to a non-indexed column.

create table test (k VARCHAR NOT NULL PRIMARY KEY, v1 VARCHAR, v2 VARCHAR)
create index test_ind ON test (v2)
upsert into test (k,v1,v2) VALUES ('testKey','v1_1','v2_1');
delete from test;
upsert into test (k,v1,v2) VALUES ('testKey','v1_2','v2_2');
delete from test;
upsert into test (k,v1) VALUES ('testKey','v1_3');