Data lost during compaction

We have experienced data loses in some tables during few weeks since update to cassandra 3.0. I thing I successfully found test case now.

Step one - test table:

CREATE TABLE aaa (
r int,
c1 int,
c2 ascii,
PRIMARY KEY (r, c1, c2));

Step two - run few queries:

insert into aaa (r, c1, c2) values (1,2,'A');
delete from aaa where r=1 and c1=2 and c2='B';
insert into aaa (r, c1, c2) values (2,3,'A');
delete from aaa where r=2 and c1=3 and c2='B';
insert into aaa (r, c1, c2) values (3,4,'A');
delete from aaa where r=3 and c1=4 and c2='B';
insert into aaa (r, c1, c2) values (4,5,'A');
delete from aaa where r=4 and c1=5 and c2='B';

It creates 4 rows (select count says 4) and 4 tombstones.

Step 3 - Restart Cassandra

You will see new files written into C* data folder. I tried sstable-tools to print table structure, it shows 4 rows, data and tombstones are there.

Step 4 - set GC grace to 1 to force tombstone removing during compaction.

alter table aaa with GC_GRACE_SECONDS = 1;

Step 5 - Compact tables

./nodetool compact

aaa files dissapeares during compaction.
select count says 0
compaction history says
... aaa 2016-02-01T14:24:01.433 329 0 {}