Bug: upload media and write post action issue

Description

When enabling the experimental block post editor and uploading a media file, the snackbar action oferring to write a post using that media is not working properly.
It does work with the old editor.

Step-by-step reproduction instructions

1. Enable the "Experimental block editor" feature
2. Go to the media browsing screen
3. Upload a media file
4. When the media is uploaded, you'll see a snackbark saying "Write a post". Tap on it
5. A new post screen is opened but the media is not automatically added

If you do the same whithout enabling te block editor, the flow works as expected.

Screenshots, screen recording, code snippet

https://github.com/user-attachments/assets/b0077e32-b343-4618-a109-9e249d8f68e3

Environment info

No response

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