save_post hook triggered on frontend

  • Hi, in my functions.php file I put this line:

    add_action( 'save_post', ['MyTransient', 'clear'] );

    Triggering save_post hook I want call clear function in MyTransient class that clear the transients.

    When I save a post it seems working fine but when I take a look in frontend I can see that save_post is triggered again.
    I noticed that because I echo a test string in clear function.
    The strange thing is that hook is triggered only the first time I visit frontend page.
    Save_post hook should not be triggered on frontend.
    How it is possible? Someone had got the same problem before?

    Thank you

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