what system are you on?
try newly issued ngit v1.5.0 (available from gitworkshop.dev/ngit). this upgrades gitlib2, which handles interaction with the git server.

I suspect if you are still getting the issue it relates to unresolved gitlib2 issues: 
https://github.com/libgit2/libgit2/issues/5279
https://github.com/libgit2/libgit2/issues/5752

I can't replicate it on that repository but I can with the following repository on debian:
nostr:naddr1qqrkxcf3xyuxzcgpp4mhxue69uhkummn9ekx7mqzyzsq3hh327t0h2dq6matqn5064cgj2zanl2stkj6s0lg4t2h5dty6qcyqqq80xg2w8nml
I've not come across it on any other repositories, and it only started happening recently on that repository.
 *I wonder if i can tie it down to a particular SSL upgrade with nix*