Using poetry2nix with flake "hangs" with no output

When I try to use poetry2nix with nix flake, the new experimental commands (e.g. nix build, nix shell, nix develop) seem to just hang. Worth noting that I am on an intel mac, although it nix flake generally works fine. There is also no output displayed either.

~/poetry2nix_flake $ nix build
<nothing output here>

Not sure how to debug/dig further. Repro here. Any help would be appreciated!

(also posted as github issue)