mask-origin-2.html test uses removed margin-box value for mask-origin

[FormularSumo]

https://github.com/web-platform-tests/wpt/blob/master/css/css-masking/mask-image/mask-origin-2.html
Under meta name="assert" the test says

Test checks whether setting mask origin to margin-box works correctly or not.

However according to https://drafts.fxtf.org/css-masking-1/#changes

The following changes were made since the 26 August 2014 Candidate Recommendation.

• Remove margin-box as possible value from mask-origin and mask-clip.

This means the attribute was removed on the 5 August 2021 Candidate Reccomendation, and so browsers shouldn't implement it now. I believe this causes Firefox and Safari to fail this test despite correctly implementing other areas of masking that are used in this test. It doesn't look like either of the mask-clip tests use margin-box so it's only this test that's affected.