The issue seems to be with mixing 2D Sorting Order/Layer but also using DepthWrite/Test in RimLight shader. This can result in non-deterministic order of rendering and can result in artifacts.
Would suggest either use URP-2D/Sorting Order/Layer
[or]
URP/Depth-Write
The issue in the scene seems to be with MimicSprite in Mureal.Prefab rendered with RimLight shader (that has Z-Depth enabled). Disabling Depth-Write in RimLight shader or disabling the Object resolves the issue.