miimsam commented on issue #24526:
URL: https://github.com/apache/airflow/issues/24526#issuecomment-1162675742

   > yeah i have confirmed locally that _if_ task_id is `utf8mb4_general_ci` in 
task_instance, it will produce that error when you try to create task_map with 
mb3 because the FK is not compatible.
   > 
   > @flrn77 @miimsam can you confirm what encodings you have for the task_id 
column in task_instance?
   
   `task_id` varchar(250) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci NOT 
NULL`


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