With 1.28.0-wmf.16 but maybe that happened earlier:
Wikibase\SqlIdGenerator::generateNewId: Explicit commit of implicit transaction. Wikibase\SqlIdGenerator::generateNewId: Implicit transaction expected (DBO_TRX set).
And another similar serie:
Wikibase\Client\Usage\Sql\EntityUsageTable::addUsages: Explicit commit of implicit transaction. Wikibase\Client\Usage\Sql\EntityUsageTable::addUsages: Explicit commit of implicit transaction.