Contract API with error after upgrading to v. 14.830 (from 14.740)

Contract API with error after upgrading to v. 14.830 (from 14.740)

Hi, Team,

After upgrading to version 14.830, one of my scripts returns an error. The same error occurs when using directly the REST API Documentation URL. I'm trying to update a contract additional field (date) with a value:
{"contract":{"udf_fields":{"udf_date_17145":{"value":1726614000000}}}}

I tried also with a string:
{"contract":{"udf_fields":{"udf_date_17145":{"value":"1726614000000"}}}}

it returns (with both inputs):
{"response_status":{"status_code":4000,"messages":[{"status_code":4001,"type":"failed","message":"Invalid email address."}],"status":"failed"}}

This was working on version 14.740.

Can you help me with this?

Thanks.

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