The details pane in Grid view plays video, and if no content is downloaded will play the full trailer. If a local trailer is present, this may be played as well. However if both a local trailer and microtrailer are present the pane does not respect the flag in Extended Metadata Tools for what video type to display, and will always play a Microtrailer if available.
Update: after multiple restarts with the correct flags set, the issue resolved.
Suspect some value was cached, and will update further if the issue resurfaces.
The details pane in Grid view plays video, and if no content is downloaded will play the full trailer. If a local trailer is present, this may be played as well. However if both a local trailer and microtrailer are present the pane does not respect the flag in Extended Metadata Tools for what video type to display, and will always play a Microtrailer if available.