Hi folks,
I have been able to reproduce the issue. JGit (the library we use to collect blame) doesn’t support on-demand loading of blobs. FYI I created a feature request, but I don’t think this is our best solution anyway.
The SonarCloud scanner requires to blame all the files in order to properly date issues and assign them.
The native Git CLI is able to load blobs on-demand, but at the cost of a huge performance penalty. It might be ok to blame only a few files, but when a lot of files are involved, I am not sure the time saved during clone will compensate.
So I suggest you disable partial cloning in your CI for the task running the SonarCloud analysis.
Alternatively, you can force the SonarCloud scanner to use the native Git CLI, but again, I am pretty sure performance will be bad. To do that, you should pass the property sonar.scm.use.blame.algorithm=GIT_NATIVE_BLAME to the scanner.