Thanks for the details. I wonder if what you are seeing are actual shadows. Perhaps those are some weird rendering artifacts.
To rule the shadows out, once you switch to the iOS platform, could you check the Shadow Cascades scene view mode? If nothing shows up (and it probably won’t), then it might be some weird rendering artifact.
Are you using any custom shaders, asset bundles, or something else that might cause this?
These are not real shadows, nothing appears in Shadow Cascades. I’m using Shader Mobile/Unlit or Mobile/VertexLit. I don’t have any asset packs that influence the shader, material or texture.
I had already done this process before, and everything went well, my game is already published on the App Store, I would just update.
The only difference, before the project was in Unity 2019.3.49, and I moved the project to Unity 2020.3.39 as I had to update “In App Aurchasing” to a version that didn’t support Unity 2019.
more details:
I’d recommend reporting a bug. We can rule out lightmaps, as you don’t use baked GI in the scene.
I’ll move this thread over to general graphics forum.
This topic has not been discussed for a while. Nevertheless, I think I found the problem. It’s not really shadows that you see, but instead this might be Ambient Occlusion (SSAO), which is enabled by default.