Abacn commented on PR #40925:
URL: https://github.com/apache/beam/pull/40925#issuecomment-6590345068

   Same question in #40549, is there any example pipeline that could trigger 
this issue?
   
   Defensive coding can be added anywhere, but given that
   - currently it's still failing in subsequent code path as well
   - and if it's not encountered in real scenario
   
   I'm leaning to leave core/hot code path as is unless a good reason and value 
for it. Window instantiation is light but hot path if it's per-element creation 
- see #40910


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