Let's Encrypt / Certbot certificate renewal crashes dovecot

Webmin: 1.942
Virtualmin: 6.09
OS: Centos 7
Certbot: 1.0.0

I have certbot installed.
When Let’s Encrypt renews a certificate dovecot crashes and cannot restart.
I cannot restart it with “systemctl restart dovecot”. I need to reboot the VPS.

● dovecot.service - Dovecot IMAP/POP3 email server
Loaded: loaded (/usr/lib/systemd/system/dovecot.service; enabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Thu 2020-03-19 21:59:38 EDT; 6s ago
Docs: man:dovecot(1)
Process: 29926 ExecStop=/usr/bin/doveadm stop (code=exited, status=75)
Process: 1967 ExecStart=/usr/sbin/dovecot (code=exited, status=0/SUCCESS)
Process: 1940 ExecStartPre=/usr/libexec/dovecot/prestartscript (code=exited, status=0/SUCCESS)
Main PID: 2065 (code=exited, status=0/SUCCESS)

However, when I use Certbot in the command line the certificate renews and dovecot does not crash.
In addition, when I look at the server’s Let’s Encrypt entry (Virtualmin… Server Configuration…SSL Certificate) the new certificate expiration date is not recognized.

As a workaround the dovecot crashes, I will set Let’s Encrypt to “renew manually” and use Certbot for all the renewals. But I would like to know why Let’s Encrypt auto renewals is causing the crashes.