Can still use null for required field in Prisma

From this doc: https://www.prisma.io/docs/orm/prisma-schema/data-model/models#optional-and-mandatory-fields, aren't all fields that isn't marked with "?" required?
I can still use null while inserting record with Prisma Studio. Please see photos attached. Thanks in advance for answers.
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Solution
Not sure exactly what is going on as Ive never used prisma studio before but your nulls might be coerced to empty strings?
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