damccorm opened a new issue, #20422:
URL: https://github.com/apache/beam/issues/20422

   Trying to use the combine transform of Python's test expansion service 
executed from the Go SDK fails during runtime. Crashes the Go SDK harness with 
the following error:
   
   unmarshalling coder 
VSkoscjkPN_Coder_TupleCoder_7_length_prefixed_windowednmarshalling coder 
VSkoscjkPN_Coder_TupleCoder_7_length_prefixed_windowed unmarshalling coder 
VSkoscjkPN_Coder_TupleCoder_7_length_prefixed unmarshalling coder 
VSkoscjkPN_Coder_FastPrimitivesCoder_1_length_prefixedcould not unmarshal 
length prefix coder from spec:<urn:"beam:coder:length_prefix:v1" \> 
component_coder_ids:"VSkoscjkPN_Coder_FastPrimitivesCoder_1" , want a custom 
coder as a sub component but got spec:<urn:"beam:coder:pickled_python:v1" 
payload:"\n\310\001FastPrimitivesCoder$QlpoOTFBWSZTWSYAoHgAAC334EwIiCAAIQkAQAC/bt0CYAQOACAAahpI0Bppo0GmRtINBqJ6QZAaNDQDyjRqC0RLwD4QPbijFck85Haypu6ovZAReEmQrcsyHc7KzNN4sFkXh7FICbooOXgwoVC0QQeEDWJD5shM4hP8XckU4UJAmAKB4A\=="
 \> 
   
   Imported from Jira 
[BEAM-10796](https://issues.apache.org/jira/browse/BEAM-10796). Original Jira 
may contain additional context.
   Reported by: kevinsijo.


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