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I had the exact same issue and have been using a static wallpaper, but after updating to 18.4 I applied it back and it seems to be fixed for me
 
Oh great... I just bought a 16+ yesterday, after having a Samsung S8+ for 8 years and an S2 before that- the battery on the S8 blew up again, popping the back off. I was gonna just get another battery from Amazon... but it's so old and there are no new updates for the OS any more... So I get my first iPhone (used them at work, but never owned before) but thankfully haven't seen this bug as I use my own photo for the background. It has 18.2.1 and I will be updating to 18.5 tonight. If I see anything after the update I will post here, but am hoping my static wallpaper continues to prevent it. At least it's 5G speeds. Feels like I just left the 4g dark ages LOL.
 
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