Trying to add new SSL certificate results in "Cannot read properties of undefined (reading 'meta')"

[EpicLPer]

Heya,

Trying to add any new SSL certificate from Let's Encrypt (renewing works fine) results in the console throwing the below error. The web interface simply shows "Internal Error".
It seems to save it just fine, but later when NPM tries to "process" that certificate somehow it seems to fail.

TypeError: Cannot read properties of undefined (reading 'meta')
    at /app/internal/certificate.js:212:52

I'm really desperate by now to fix this issue as I can't get any new subdomain certs now for multiple months. I've already created an issue #3489 but it hasn't gotten any responses in months now :(

Thanks already for your help!