Build progress goes to 100% much before build is done

I upgraded from v4.9.0 to v4.11.0 and now the build progress bar is broken. I build with CMake+Ninja. The problem is that the build progress bar reaches 100% or very near while the build is not even half-way done.

I am not sure what information I can provide that can help you troubleshoot this, but I am happy to provide whatever you ask for. Also, I run a Qt Creator that I build from git, so I can test patches. I can also take a look at the problem myself, but in that case, I would appreciate someone pointing me at good "suspects"