Pipeline tests: error SQLITE_BUSY

Some tests (only located in test_official suite) have failed in "main" pipeline due to SQLite error "SQLITE_BUSY: database locked". This situation caused the failure of 53/119 tests, whereas it does not happen neither in local nor in containers (such as "testdelivery" pipeline, which dectected only 8 test failures, the same as a local environment). Could be an error related to a too heavy workload on the database?