Addons.hostname not working anymore on OS X builds

for our builds we require a fixed hostname. It seems that on OS X builds you generate new hostnames for every new process. Therefore we use the addons.hostname value in our travis file to set a fixed hostname.

This worked fine until yesterday.
See e.g. this build:
Note the hostname, it is set to ‘travis-osx’.

Since today the build is failing:
Note the hostname is now again the old behavior: ‘Traviss-Mac-6’

Git diff (nothing was changed in the .travis.yml):

I seems that you changed something in your system that the custom hostname is not picked up anymore?

Do I need to change the travis.yml file to get fixed hostnames?