Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED

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Background

• Operating System: Arch Linux
• CKAN Version: 1.30.4
• KSP Version: 1.12.3.3173
  I haven't made any manual modifications to KSP's files.

Problem

Exactly the same issue as the currently pinned issue, #3468.

Steps to reproduce
Install ckan-bin through yay
Attempt to install a mod with its primary host being spacedock (KIS and KAS yield this problem for me)
Get error'ed

Expected behavior
CKAN manages to download the mods

Error downloading KAS 1.10: Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED
  at /build/mono/src/mono/external/boringssl/ssl/handshake_client.c:1132
Error downloading KIS 1.29: Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED
  at /build/mono/src/mono/external/boringssl/ssl/handshake_client.c:1132

Further Details
Having read the pinned issue, I read the arch section on the workaround for this bug, and decided to attempt fixing it.

However, I found that the certificate being talked about here, /etc/ssl/certs/DST_Root_CA_X3.pem, does not exist at all on my system, so I could not blacklist it.
I attempted the rest of the steps, just in case my Mono install had outdated certificates, but I found that this did not fix the situation.

If I can provide further details on my install, or other related certificates in my system/blacklist folders, I will.
If it's any help, i can browse spacedock through https just fine, so there is a valid certificate for them somewhere in my system. Not sure what's going on.

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Update: I ran through the checklist of causes for the bug on the wiki page for SSL Certificate errors, and have verified that I am indeed running mono 6.12.0

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I have now manually run through mono's Trust store and found /usr/share/.mono/certs/Trust/ski-79B459E67BB6E5E40173800888C81A58F6E99B6E008B8263BBE0634459E340D2B0CF108200.cer, which appears to be the ISRG Root X1 certificate, which is what my browser identifies as the root certificate that eventually validates spacedock.info, so there is a valid certificate in the mono trust store.

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I have done the same for the expired DST Root CA X3 cert, and nowhere to be found in the mono trust store.

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Is there any way I can identify which expired certificate could've caused the issue?

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Wow, it, uh, started working?
Is it possible for a certificate chain to start and stop working like that?
Either way, it seems to now be irreproducible on my side.
Closing.