Issue with FBInstant.ShareAsync

Hi,
I’m trying to use FBInstant.ShareAsync from a game made with Unity.
My function is

ShareAsync: function (base64Picture, text) {
     var img = Pointer_stringify(base64Picture);
     FBInstant.shareAsync({
     intent: 'REQUEST',
     image: img,
     text: Pointer_stringify(text),
     data: { myReplayData: '...' }
   }).then( function()
   {
       console.log("sharing is done");
   })
   .catch( function(err)
   {
      console.log('failed to share: ' + err.code + " :: " + err.message);
   });
  }

I can correctly see the image but no text appears, and I have three errors in the console repeating:
“POST https://www.facebook.com/react_composer/logging/ods/?event=bootload_start&attachment_type=MEDIA 404”.
I’ve tried also with static string for both text and image, but nothing change.

Any advice? Thanks in advance.

Same problem here! Any solution?

This reads like a bug in Facebook’s API (or in the use of that API). You might also try reaching out to Facebook developer forums if they might have suggestions, or if it’s a known bug there?