In source control window, external actors are listed under normal changelist instead of uncontrolled changelist.
Attempting to revert these actors in the changelist window fails: "LogSourceControl: Warning: This operation could not complete on the following map or external packages, please unload them before retrying".
The actor will reappear after restarting the QAGame project and opening the map again.
Deleting the actor and saving no longer summons the checkout prompt with the file permission no longer read-only.
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There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-225649 in the post.