DI compile step keeps failing after upgrading from 2.3.3 to 2.3.5 via composer. [Magento 2 EE]

The error is the same every time I've tried, which is:

PHP Fatal error: Declaration of Magento\PageBuilder\Model\Dom\NodeList::item($index) : ?Magento\PageBuilder\Model\Dom\Adapter\ElementInterface must be compatible with Magento\PageBuilder\Model\Dom\Adapter\NodeListInterface::item(int $index): ?Magento\PageBuilder\Model\Dom\Adapter\ElementInterface in vendor/magento/module-page-builder/Model/Dom/NodeList.php on line 19

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