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what's the trigger condition about the table partition in auto gather stats list

in Database Administration (MOSC) Question
Hi, experts

  As we know  when the table partiton   (insert+update+delete) >STALE_PERCENT*(dba_tab_partitions. numrows)   or this partition has truncate flag  or drop partion flag(query DBA_TAB_MODIFICATIONS) .  then Oracle will auto gather this partition  stats. 
   Are there any other conditions  ?
   I have a very  strange problem   one user table partition   is  gathered stats  by auto gather stats schedule  after upagrade to19c from 11g.  there  no data change   no truncate and no drop parttion after last analyzed time. 




Thanks
Jason Ma

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