@Chackett8h
You probably paused your Roku long enough for the screen saver to kick in while a Star of David was part of the image. The rock and several other small sections of the Aquatic Life screen saver are semi transparent, allowing the paused image to bleed through.
I never noticed this before a few weeks ago, on an Ultra 4800, so it may be something relatively new. Frozen closed captioning seems especially likely to bleed through, perhaps due to its high contrast.
See this earlier thread that includes some screen shots: https://community.roku.com/t5/Features-settings-updates/Aquatic-Life-Screensaver-is-semi-transparent...
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Ultra 4850 | Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X