Received unexpected fields `{'partition_transform'}`

```
PipelineStepFailed: Pipeline execution failed at `step=extract` when processing package with `load_id=1769072235.060821` with 
exception:

<class 'dlt.common.exceptions.DictValidationException'>
Path `new_table/<my_table>/columns[event_timestamp]`: received unexpected fields `{'partition_transform'}`
```

Seems not to work i.e. does not pass dlt validation :/

dlt==1.21.0