Common mistakes when baking prefab 3D models include poor UV unwrapping (overlapping/stretched UVs), misaligned high-poly/low-poly topology, and overcomplicating bake settings (e.g., unnecessary map types).
These issues cause texture artifacts (from bad UVs), missing details (from misalignment), or bloated files (from extra settings).
To fix this, test small-resolution bakes first or use pivot points to align models—this catches errors early without wasted effort.