View quantity filter does not work correctly

When creating a view of products or of product variations, setting the stock level filter to allow users to filter by in stock items only does not work as expected. Some out of stock items are returned. This issue appears when using either the Quantity field or the Stock Level field directly.

I've tried a cache rebuild and clearing cache through the ui, as well as updating from the most recent stable to the current dev version. This has been tested in multiple different purpose built views, and always works incorrectly.