updating model breaks admin

If the data is not important, try to delete migration files from `migrations` package, drop the database tables and reference M2M relationship using strings:

tags = models.ManyToManyField('Tag')

Or if the Tag model is in another app:

tags = models.ManyToManyField('app_name.Tag')

Then run `makemigrations` and `migrate`

Can you also share the `Tag` model and related `ModelAdmin` classes?

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