uranusjr commented on issue #24624:
URL: https://github.com/apache/airflow/issues/24624#issuecomment-1165413332

   Since a variable can contain any value (including a blank string), there’s 
no way I can think of we can restore the original value without sending the 
value to the frontend. So I guess the only reasonable way we can prevent this 
from happening is to add some JavaScript, so the variable form cannot be 
submitted unless the user re-enters something in the _val_ field.


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