When a multibranch build is built using a branch with a slash (e.g. feature/xyz), the workspace folder is created using the encoded name "feature%2Fxyz". When visual studio sees this while resolving paths , it takes "%2F" as a "/".

So visual studio thinks there is supposed to be a subfolder under "feature" called "xyz".This causes the build to fail if there are relative paths to files that devenv attempts to resolve