common role: suddenly commented out most certs in ca-certificates.conf

Hi all, after running bootstrap and during common role adding of additional apt sources failed because of unknown certificates. FAILED! => {"changed": false, "cmd": "/usr/bin/git clone --origin origin https://github.com/TheLocehiliosan/yadm /usr/local/src/yadm/github.com/TheLocehiliosan/yadm", "msg": "Cloning into '/usr/local/src/yadm/github.com/TheLocehiliosan/yadm'...\nfatal: unable to access 'https://github.com/TheLocehiliosan/yadm/': server certificate verification failed. I inspect the problem and found that most of certificates configured in /etc/ca-certificates.conf where commented out suddenly. This is not really reproducible but the error took place some times in the past. Any idea what is happening here? Thanks and regards Jan