kennknowles opened a new issue, #19432:
URL: https://github.com/apache/beam/issues/19432

   Referencing the timer in its on_timer callback produces a recursive pickle 
error.  
   ```
   
   @userstate.on_timer(timer_spec)
   def process_timer(self, timer_1=beam.DoFn.TimerParam(timer_spec)):
   
   ```
   
   Unit test: 
[https://github.com/apache/beam/blob/cbe4dfbdbe5d0da5152568853ee5e17334dd1b54/sdks/python/apache_beam/transforms/userstate_test.py#L67](https://github.com/apache/beam/blob/cbe4dfbdbe5d0da5152568853ee5e17334dd1b54/sdks/python/apache_beam/transforms/userstate_test.py#L67)
 
   
   Imported from Jira 
[BEAM-7127](https://issues.apache.org/jira/browse/BEAM-7127). Original Jira may 
contain additional context.
   Reported by: thw.


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