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[hjalali (Hossein Jalali)]

Just to note that this fixed the problem:

Upgraded to 2.5.0beta4 and now YouTube og:image is not being picked up

This should be resolved by https://github.com/discourse/discourse/commit/0c6f30d92a4090aa7447e2e579a17a180e49ce17 After updating, you will need to Rebuild HTML on posts for the thumbnail to be re-fetched.