Sonarr unable to connect to SABNZBD

Sonarr version (exact version): 3.0.1.441
Mono version (if Sonarr is not running on Windows): extra/mono 5.20.1.19-1
OS: Arch Linux
Debug logs: https://pastebin.com/jRkFT6ex
Description of issue: After system update, Sonarr is unable to connect to SABNZBD. If I ‘test’ SABNZBD from within Sonarr it says unable to connect to the server, JournalCTL says it’s an issue with Mono.Btls.MonoBtlsException: Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED.

I’d already tried removing username/password in SABNZBD and refreshing the API Keys, still the same. Also tried sudo cert-sync /etc/ssl/certs/ca-certificates.crt

Disabling https in SABNZBD results in different errors:

Mono.Btls.MonoBtlsException: Ssl error:100000f7:SSL routines:OPENSSL
_internal:WRONG_VERSION_NUMBER
  1. Make sure you’re not using legacy SSL in mono (Do not use the MONO_TLS_PROVIDER=legacy environment variable
  2. If you’re using a self signed certificate, disable certificate validation for local addresses

How do I ensure I’m not using legacy SSL in Mono?
How do I know if I’m using a self signed certificate? I just installed SONARR and SABNZBD without anything extra.

  1. Make sure the environment variable above is not set to legacy).
  2. Unless you imported a certificate from a trusted certificate authority (either paid or free) then you’re using a self-signed certificate, but you can check in your browser as well to see

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