SQLite database got malformed during use in multithreads

Since Qt 5.10.1 released we realised that our clients, who used our software, got their local sqlite database to be failed with messages like "malformed database image" or "disk write error I/O" and command "check integrity" on such databases tells about errors.

Our software been working ok since Qt5.5 and we didnt change SQLite part, and we had releases on 5.5, 5.7, 5.8, 5.9 and never had such problems. But now after 5.10.1 we got it. So I founded that 5.9.4 SQLite version is 3.16.2 and Qt 5.10.1 has 3.20.1 sqlite version.

Is it your bug or new behavoir of new sqlite version?

To produce this bug one could open 2 thread, in each do cycle of insert in database 1 row. After second cycle starts there are many errors on insert like this: 

"database disk image is malformed Невозможно получить строку" sql: "INSERT INTO `users` (name, email, num) VALUES ('user_thread_297', 'email@mail.ru', 297);"

And such error occurs only on 5.10.1 not on 5.9.4.