“ERROR: __clone method called on non-object” 500 response when trying to access specs

[sideshowbarker]

Getting a “ERROR: __clone method called on non-object” 500 errors when trying to access specs” 500 response when trying to access the following specs:

• https://drafts.fxtf.org/css-masking/
• https://drafts.fxtf.org/filter-effects-2/
• https://drafts.fxtf.org/geometry/
• https://drafts.fxtf.org/motion/

However, I can get success responses for the following:

• https://drafts.fxtf.org/compositing/
• https://drafts.fxtf.org/filter-effects/

[plinss]

This is a dupe of w3c/csswg-drafts#6528 (it's all the same server)