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It will go away after a few hours of not displaying anything. Samsung uses cheaper displays on their watches after the holidays/new year to my experience with so many watches, I've returned a few for this and had to just accept this on my old watch 5(I just got a watch6c and it does not have ghosting).
It does not appear to damage the display as it does go back after awhile(although all oled panels do wear/burn permanently over time).
I always use always on display and after 7 months the display did not show any signs of permeant damage even with constant ghosting of watch faces and images.
To reduce this occurrence, it may be helpful to turn down the brightness – especially during periods where the always on display (or anything static) is on the screen for a prolonged period of time. 🙂