The developments have cemented success for China's sweeping campaign to end domestic poverty before 2021 despite the impact of the earlier COVID-19 outbreak and the more recent floods wreaking havoc in southern provinces.

这里的floods也是其后wreaking的逻辑主语吗？还是wreaking havoc分词短语是floods的后置定语？

请专家老师一定为我解惑，十分感谢。