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This follows the same principle as in #28611. We cannot serialize Blobs of a form data into HTML because you can't initialize a file input to some value. However the serialization of state in an Action can contain blobs. In this case we do error but outside the try/catch that recovers to error to client replaying instead of MPA mode. This errors earlier to ensure that this works. Testing this is a bit annoying because JSDOM doesn't have any of the Blob methods but the Blob needs to be compatible with FormData and the FormData needs to be compatible with `<form>` nodes in these tests. So I polyfilled those in JSDOM with some hacks. A possible future enhancement would be to encode these blobs in a base64 mode instead and have some way to receive them on the server. It's just a matter of layering this. I think the RSC layer's `FORM_DATA` implementation can pass some flag to encode as base64 and then have decodeAction include some way to parse them. That way this case would work in MPA mode too.