[BP of MB-31336] - unstable result set

steps to repro:

1. create standard bucket `temp_bucket`
2. CREATE primary index ON temp_bucket
3. INSERT INTO temp_bucket VALUES(UUID(), {"CUSTOMER_ID":551,"MSISDN":UUID(), "ICCID":UUID()})
4. INSERT INTO temp_bucket (KEY UUID(), VALUE d) SELECT {"CUSTOMER_ID":551,"MSISDN":UUID(),"ICCID":UUID()} AS d FROM temp_bucket WHERE CUSTOMER_ID == 551;
5. repeat step 4 9 times
6. CREATE INDEX `xi1` ON `temp_bucket`(`CUSTOMER_ID`,`MSISDN`);
7. CREATE INDEX `ai_SIM` ON `temp_bucket`(distinct pairs({`CUSTOMER_ID`, `ICCID`, `MSISDN` }));
8. select TIM_ID, MSISDN from temp_bucket WHERE CUSTOMER_ID = 551 ORDER BY MSISDN ASC LIMIT 2 OFFSET 0

Last query returns 2 results which is correct, but sometimes it returns 0 results. Just run it several times from web interface.