SYSTEM post-receive hooks broken since 7.8

We used to be able to use post-receive hooks, and none of them are being called after upgrading to 7.8

Putting hooks in the custom_hooks folder, the pre-receive one gets called but not the post-receive one.

I tested by putting a one-liner bash script in one of my repos that do 'echo "test" > /tmp/test'. This output the data if ran by the git user, but is never invoked by pushing code to the gitlab server.