Protonvpn being weird with cache.nixos.org specifically

When running home-manager switch to retrieve cache.nixos.org packages, I get the “Failed sending data to the peer” error. Without the VPN enabled it works just fine, so this is definetley where the issue is.
HOWEVER, putting the URLs into a browser downloads them just fine, so I think the VPN itself can’t be the issue.

I got vpn+, so I do have full access (if any tips require advanced features). Thanks in advance ^^