Change record status: 
Project: 
Introduced in branch: 
10.3.x
Introduced in version: 
10.3.0
Description: 

In order to fix a caching regression when generating the local thumbnail for an oEmbed media source, the $media entity needs to be passed to \Drupal\media\Plugin\media\Source\OEmbed::getLocalThumbnailUri().

Impacts: 
Module developers