I'm really sorry to duplicate my issue, but you gave me a detail explanation and I would like to answer, because you contradict to yourself, your words: IF the unsupported widget has an iFrame version, make it into an <iframe>. If you do that, the IV page will not be generated due to unsupported content, but things will work out of the box if and when we support that widget. [TRUE]
I repeat: If you do that, the IV page will not be generated due to unsupported content, but your page is clearly generated - so maybe you wrap this iframe icorrectly, but in all cases this should not give the error: embed_not_supported. It should be element_not_supported without generate IV
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IF the unsupported widget has an iFrame version, make it into an <iframe>. If you do that, the IV page will not be generated due to unsupported content, but things will work out of the box if and when we support that widget. [TRUE]
I repeat: If you do that, the IV page will not be generated due to unsupported content, but your page is clearly generated - so maybe you wrap this iframe icorrectly, but in all cases this should not give the error: embed_not_supported. It should be element_not_supported without generate IV