jellyfin-plugin-webhook
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Item Added notification sent before content metadata is added
The Item Added notification will sometimes fire before content metadata is added, causing things like the overview or poster image to not be available.
Example:

The plugin waits a good amount of time to ensure that metadata is populated before sending the item added notification. Maybe we need to increase the delay
It works a good amount of the time. Just a few times where it doesn't is annoying.
Have you tried to set the default timer for the Item Added notifier with higher value?.
On my case was very low (lower than 0.01 minutes), which didn't allow to all metadata and images to be downloaded.
I set it up to 15 minutes (the minimum the settings allow).
In my case, the Telegram webhook was not working because the image was not downloaded yet. And others the name of the movie was not yet being retrieved, appearing like the folder/file name instead.
Hope it helps.