read input from stdin does not work

[fentas]

Simple docker-compose.yaml

version: '3'
services:
  backend:
    image: helloworld

kompose convert --stdout -f docker-compose.yaml works with no problems but

bash-4.4# cat docker-compose.yaml | kompose convert --stdout -f -
ERRO Could not parse config for project application : yaml: unmarshal errors:
  line 1: cannot unmarshal !!str `3` into config.RawService 
FATA composeObject.Parse() failed, Failed to load compose file: yaml: unmarshal errors:
  line 1: cannot unmarshal !!str `3` into config.RawService 

don't.

bash-4.4# kompose version
1.16.0 (0c01309)