Changing postgres timestamp mode (string -> date) isn't reflected in migrations

Hi.
I have my migrations generated and applied from my initial schema.
Now in the schema I changed to

mode: 'date'

mode: 'date'

mode: 'date'

mode: 'date' in multiple timestamp columns (ex:

time: timestamp({ withTimezone: true, mode: 'date' }).notNull(),

time: timestamp({ withTimezone: true, mode: 'date' }).notNull(),

time: timestamp({ withTimezone: true, mode: 'date' }).notNull(),

time: timestamp({ withTimezone: true, mode: 'date' }).notNull(),). This was

mode: 'string'

mode: 'string'

mode: 'string'

mode: 'string' by default previously.

Now when I run the

drizzle-kit generate

drizzle-kit generate

command, no migrations are generated. I made this change to multiple columns.
Is this a bug or is it expected behaviour?