nicoloboschi opened a new pull request, #18898:
URL: https://github.com/apache/pulsar/pull/18898

   Fixes #18897
   
   ### Motivation
   
   System topics on user namespace may be subject to have encryption set on the 
producer side. However they can't be forced to be encrypted since the 
encryption keys are set on the client side. Also they don't contain sensitive 
data. 
   
   The two main cases that I encountered are:
   1. __change_events: if you enable topic level policies
   2. transaction side topics
   
   ### Modifications
   
   * Always allow messages in the system topics to not be encrypted
   * Fix writability check for txn on the broker's producer 
   
   ### Documentation
   
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   - [ ] `doc` <!-- Your PR contains doc changes. Please attach the local 
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   - [ ] `doc-required` <!-- Your PR changes impact docs and you will update 
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   - [x] `doc-not-needed` <!-- Your PR changes do not impact docs -->
   - [ ] `doc-complete` <!-- Docs have been already added -->
   


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