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I have a few apex test class, that pass when i run them while deploying a change set, but when i run them from the setup, in "Apex Test Execution", they fail with the error MIXED_DML_OPERATION (the reason this error pops is because we have a user workflow that does an unnecessary update)

Why the errors don't appear in deployment?

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During deployment, Mixed DML operations checks are skipped. Here is a knowledge article regarding this: https://help.salesforce.com/articleView?id=000231160&type=1

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