potiuk commented on PR #25579:
URL: https://github.com/apache/airflow/pull/25579#issuecomment-1207376980

   Hm... Thinking of it - I think this might be caused because our MySQL in 
tests uses utf8mb4 
https://github.com/apache/airflow/blob/main/scripts/ci/docker-compose/backend-mysql.yml#L23
 and possibly the problem is when default encoding was 'latin2` (from MySQL 5.7 
- where latin2 + swedish collation were still the default). 
   
   @alexott  what wa default encoding when you experienced the failure ? 
   
   Maybe we should run separate upgrade test with latin2 + swedish as default 
encoding :)? 


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