Multiselect field required

[molotow11]

Hi, Guys!

I have a problem to migrate json field into multiselect
For some reason multiselect field going to be required in the db and I see the following message:

- Made the column `colors` on table `Test` required, but there are 2 existing NULL values
To apply this migration, we need to reset the database

I've tried to add default: [] to the multiselect field definition, but no luck. Any other properties not available for this field.
Any ideas how to solve it?