Certificate verification on devel stream

[8191]

I've started up one of my devel machines after a longer time being offline. I faced the issue with not being able to update due to server certificate validation issues with the let's encrypt upstream. After some recommendations in other threads I removed all Let's Encrypt roots and intermediates from the certificate trust, then I switched to a HTTP mirror and accomplished to update.
Now I'm facing the situation that when trying to change to the devel stream (mirror type 'Development') I get verification errors, but on the community stream updating is possible via the same mirror even using HTTPS (default mirror - pkg.opnsense.org).

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***GOT REQUEST TO UPDATE***
Currently running OPNsense 22.1.9 (amd64/OpenSSL) at Sat Jun 25 22:00:51 CEST 2022
Updating OPNsense repository catalogue...
Certificate verification failed for /CN=pkg.opnsense.org
34372419584:error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed:/usr/src/crypto/openssl/ssl/statem/statem_clnt.c:1916:


How is server certificate verification related to the chosen release type?? I'm out of ideas what to try (curl https://pkg.opnsense.org actually works without issues).