Custom fields aren't saved when creating a new contribution

Step to reproduce:

Create a custom fields group for contributions of type "member dues"
Add a field "test" type money

Add a contribution of 20 and put 10 into money

http://drupal.demo.civicrm.org/civicrm/contribute/add&reset=1&action=add&context=standalone

The field test is empty.

However, you can modify it and it's saved, only the creation seems to be the problem.

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