Image Preview after $set in FileUpload field

I have code like this:

$set('relation', ['image_path' => [$relativeFilePath]]);

$set('relation', ['image_path' => [$relativeFilePath]]);

$set('relation', ['image_path' => [$relativeFilePath]]);

$set('relation', ['image_path' => [$relativeFilePath]]);

After saving, I get to see the preview and data is saved correctly. However before saving, I don't get a preview.

Any clue?

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