Incorrect implementation of Thumbnail::prepareDataSource

[sivaschenko]

• DataObject should be replaced with a model in \Magento\MediaGalleryCatalogUi\Ui\Component\Listing\Columns\Thumbnail::prepareDataSource

[m2-assistant]

Hi @sivaschenko. Thank you for your report.
To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

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