Unable setup filter in Flows

Rancher 2.x
1

by adding a new flow like:

apiVersion: logging.banzaicloud.io/v1beta1
kind: Flow
metadata:
 name: demo-flow
spec:
 filters:
   - dedot:
       de_dot_separator: "-"
       de_dot_nested: true
 selectors: {}
 localOutputRefs:
   - demo-output

but it changed to:

apiVersion: logging.banzaicloud.io/v1beta1
kind: Flow
metadata:
 name: demo-flow
spec:
 filters:
   - {}
 selectors: {}
 localOutputRefs:
   - demo-output

after saving it.