Deleted piwik.js restores itself

Hello,

After running diagnosis I have goten this message.

Es wurden unerwartete Dateien in deiner Matomo-Installation gefunden.
-- Bitte lösche diese Dateien, um Fehler zu vermeiden. --

Zu löschende Datei: misc/cron/piwik.js

I deleted piwik.js as recommended, rerun diagnosis and got no further messages.

But, after some days, when I run diagnosis again, the message appeared again.

I tried this several times but with the same outcome.
How can I delete piwik.js effectively?

Thanks and Regards