Error on automatic renewal: Unable to unmarshal NewOrder request body

[stayallive]

I am receiving daily emails with Let's Encrypt errors I cannot place.

   Invalid response from https://acme-v02.api.letsencrypt.org/acme/new-order.
   Details:
   Type: urn:ietf:params:acme:error:malformed
   Status: 400
   Detail: Unable to unmarshal NewOrder request body

The following Let's Encrypt certificates have been renewed without some of their Subject Alternative Names:

<none>

The funny thing is that certificate renewals when done manually through the Plesk interface (without changing any settings) are working just fine.

Any clue how to fix?