Thin, Jagged Black Line appears around all 3d Models against distant backgrounds

Hello, I recently somehow made some change to my project, not sure what looking at the version control, which is causing all of my models to be outlined by a thin, black jagged line if the background behind them is far enough away (usually meaning the skybox but sometimes the terrain if far enough). The effect looks like this:


before it looked like this (see no black outline around hats or spears against sky for example):

does anyone know what could be causing this? I have tried edits to the camera, culling distance, terrain, skybox, projectors, and so on. If I change the material out to some other material, or the material’s shader to another shader, some of them don’t have the effect. The shader is the universal render pipeline lit shader and I am using URP, unity 2021.3. I have not edited that shader or the material in question. I worked with some other shaders, but they aren’t URP built in ones, so I don’t think they should have affected this?

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