Custom Doctype changes deleted after bench-migrate

each time i change anything in the doctypes and i migrate, the changes is deleted but not the main file, what is wrong?

Do you have "developer_mode":1 set in your site_config.json?

@vjFaLk yes i do, the changes is deleted only after i make: bench-migrate

i made a lot of changes in the new module and i am afraid to migrate again, it will be lost all :frowning: