Currently, the poster image property is not working due to the following problem in the Vistack library:
GitHub issue for the Vidstack library
Keep this issue here (since this problem is definitely noticeable to the end user currently) to avoid duplicates, and mark it as complete when the GitHub issue is resolved. Any progress on the library issue is also appreciated by us here!
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Code
Maybe it would also be good to get some eyes on following issue to get bigger thumbnail images for remote_video media entities which could be useful for poster images.
✨ Get large thumbnail for Vimeo and Youtube in media oEmbed. Active
What do you think?