Latest version of cookiecutter from master. Last commit ceafa1dc1b5eb70835ffba5dc7457df269d77ba8

In my pre_gen_project hook, I have this code: {{cookiecutter.should_be_list | to_sequence}} which turns a string into a list but cookiecutter raises a TemplateAssertionError jinja2.exceptions.TemplateAssertionError: no filter named 'to_sequence'. I know that my to_sequence filter isn't the issue because when I use it in other parts of my template and remove it from the pre_gen hook, everything executes successfully.

Are the custom extensions intended to only be loaded after the pre_gen hook is finished executing?