Configuration for `startup_shutdown` always showing changes

Every plan show differences in `startup_shutdown` that should be `null` even though it is not specified in the tf file. 
```
- startup_shutdown {
          - order            = -1 -> null
          - shutdown_timeout = -1 -> null
          - startup_delay    = -1 -> null
        }
```
The provider version is `3.0.2-rc07` and this wasn't an issue in previous versions.