Objects gets a strange ghost/shadow agains Gaia ocean

[Marius]

Objects get a strange ghost/shadow against the Gaia ocean. It only happens when the camera moves. I recorded a short demonstration, but it is hard to see since it only happens when you move. I have looked at it in detail, and the problem only seems to happen when the ocean is the backdrop of the items.

This only happens in build, not when testing it in the editor.

Any ideas on what the problem is?

 

Edited April 5, 2023 by Marius
additional information

[Bryan]

Hmmm not sure about this one. 
I can't tell if this is a shadow or rending issue. 
As a quick test can you change the Anti-aliasing to SMAA or TAA? 

[Marius]

The problem is that Highlight Plus (https://assetstore.unity.com/packages/tools/particles-effects/highlight-plus-134149) and Gaia don't play well together in this regard. When I removed the Rendering feature required for this asset, the problem went away. No idea what part of that asset and Gaia is causing the issue, but it dissapared when I removed it. Had the same problem with Crest Ocean, and that is where I discovered the conflict.

[Bryan]

Interesting... Thank you for the update.