How did oceans re-oxygenated after end Permian extinction when there was widespread euxinia and lot of photosynthetic sulphur microbes?

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From what I have learnt about Permian extinction, the oceans were hit terribly hard by it due to ocean acidification, high temperature (who don’t retain oxygen that good) and lot of euxinic and anoxic zones. This would have been ideal for microbes who thrived in such situations.

So, how did the oceans got oxygenated again even after wide-scale euxinia, especially considering that oceans remained in such state throughout the boring billion?

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