Bug Depth of Field at Quarter or Half, without High Quality Filtering, causes glitches on edges

Any idea why the Depth of Field would render black edges like in the following image? The only way we found to fix it is to set its quality to at least Half + High quality filtering. Quarter + HQF still bugs, but with less severity. The same goes for Half without HQF.



The issue occurs on all platforms, including in the editor.