yihua opened a new issue, #20275:
URL: https://github.com/apache/hudi/issues/20275

   When a 1.x writer creates a table with hoodie.write.table.version below 8, 
TableBuilder persists only hoodie.table.keygenerator.type, plus 
hoodie.table.keygenerator.class for USER_PROVIDED key generators. Hudi 0.x only 
knows hoodie.table.keygenerator.class, so it sees a table without a key 
generator and silently falls back to the write config, which can disagree with 
how the table was written.
   
   The 8 to 7 downgrade handler already writes the class for exactly this 
reason. Table creation below version 8 should do the same.
   


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