The best tool for debugging is the Nuxt DevTools integration with Nuxt OG Image.
This will show you your OG Image and give you all of the debug information.
You can enable the debug option which will give you more granular output.
You can use the following Stackblitz playgrounds to experiment with Nuxt OG Image and submit issues.
If you run into any issues with Nuxt OG Image, it's recommended to clone of these playgrounds Stackblitz to reproduce the issue.
StackBlitz runs Nuxt within a webcontainer, so it has fairly limited compatibility.
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