Mismatch between pixel shader output and render target view format

[3Shain]

In Cities Skylines II, a pass-through pixel shader writes 4-component float value but the corresponding render target is with format of R8_UINT (verified by apitrace). I have no idea what the intention is, but Metal certainly doesn't like it: Failed to create PSO: output of type float4 is not compatible with a MTLPixelFormatR8Uint color attachment.