I am not forwarding acme requests to https. Actually, other than a specific folder, all requests can be accessed through either http or https.
When I renew the certificate, the error messages are the same.
Type: urn:acme:error:connection Detail: DNS problem: query timed out looking up CAA for
I can see the requests from the validation server 66.133.109.36 and there were no errors found in apache2 log files. So the problem is still in the CAA records checking step.
Despite the error messages, the renewal seems to be successful. The expiration date has been updated.