Build starts for every new branch when auto-branching and a trigger are on the same plan

I'm using Git.

If I create a plan that has a trigger of any kind (say, one that causes the build to kick off once a day at midnight on the master branch), and I enable automatic branch creation on that same plan, then every time someone creates any new branch (that is, pushes a branch that previously did not exist) in my Git repository Bamboo will immediately start a build for that new branch.

This is obviously very bad and not what I want. What I want is for (a) the build to run on the master branch automatically once every day at midnight, and separately (b) branches to be created automatically by Bamboo so that users can manually start builds on their personal branches.

Having Bamboo automatically start builds like this means I can't use automated branch creation on any plan that has a trigger.