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Do anyone know why my pulumi show this?
I don't change anything in my code?
```pulumi preview
Previewing update (xxx-dev):
     Type                     Name               Plan       Info
     pulumi:pulumi:Stack      xxx-dev
 ~   ├─ gcp:compute:Instance  tuanlq-ocp         update     [diff: -attachedDisks]
 ~   ├─ gcp:compute:Instance  tuanlq-observer-0  update     [diff: -attachedDisks]
 ~   ├─ gcp:compute:Instance  tuanlq-observer-1  update     [diff: -attachedDisks]
 ~   └─ gcp:compute:Instance  tuanlq-observer-2  update     [diff: -attachedDisks]```