shuaijinchao commented on issue #4077:
URL: https://github.com/apache/apisix/issues/4077#issuecomment-968305357


   @chzhuo Thanks, I reproduced the problem. The reason for this problem is 
that when healthcheck fills the default value, the table object in the 
`defaults` variable is directly assigned to the `opts` variable, while the 
shallow copy used in the table type variable assignment in Lua. So when using 
`to_set` to update the `opts` variable, the `defaults` variable will also be 
affected, because the memory address of the operation is the same.


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