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On Plesk for Linux mod_status is disabled on upgrades to improve Apache security. This is a one-time operation that occurs during an upgrade. You can manually enable mod_status later if needed.
I am pretty sure it is not of importance: the Let's Encrypt Plesk extension uses the webroot approach, which is a different way of checking the challenge.
Moreover, Let's Encrypt closed the method of the TLS-SNI-01 challenge.