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Displaying CC on scaled down video


We have a live HSL stream to play with embedded 608/708 captions. So we updated the video.content.subtitleConfig field to  {Trackname: "eia608/1" }.
We have the subtitle playing correctly when the video node is full screen but if we scale it down, the captions stop rendering.

Is it a requirement (I haven't found this in the documentation) for the video node to be full screen for the caption to render properly ?
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