VideoPress block: Privacy setting remains available even when it's not usable

[SiobhyB]

Describe the bug

After adding a VideoPress public video (e.g. https://videopress.com/v/OcobLTqC), it's possible to access the Privacy and Rating panel under the VideoPress block's settings, even though it's not possible to actually change the block's privacy.

It is unlikely that many users will go through this flow, but would still be ideal if we could either improve the error message or hide the privacy setting when it can't be used.

This is also an issue on web, issue here: Automattic/jetpack#29964

To Reproduce

Steps to reproduce the behavior:

1. Go through the steps to add a VideoPress block to a post.
2. Select the option to Insert from URL.
3. Add a VideoPress public video (e.g. https://videopress.com/v/OcobLTqC).
4. Navigate to the Privacy and Rating panel in the block's settings.
5. Change the block's privacy from public to private and then save the post.

Expected behavior

It's not actually possible to change the privacy of the public video. As such, I would ideally expect to not even have access to the Privacy and Rating panel. If the panel has to remain in place, I would at least expect an informative error message to guide me on why it's not possible to tweak the video's privacy.

[fluiddot]

I noticed that also Details settings (i.e. Title and Description) can't be edited on a VideoPress public video. In fact, doing this in the web version produces an error and locks the block settings.

web-update-details-settings.mp4