DM lost some RENAME TABLE for sync mysql to tidb

step 1. in upstream mysql, execute following query:
rename table xx.t1 to xx.t1x;

step 2. check in tidb. got right result
select * from xx.t1x

step 3. now, in upstream mysql, execute following query:
rename table xx.t1x to xx.t1;

step 4. check in tidb, got error: Table 't1' doesn't exis
select * from xx.t1;