Issues with gomod2nix

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Hey all, I am having some issues with getting these 2 pieces of software packaged with gomod2nix (GitHub - terra-money/core: GO implementation of the Terra Protocol and GitHub - regen-network/regen-ledger: 馃尡 Blockchain for planetary regeneration). When gomod2nix works its amazing! But I find it kind of hard to debug when it goes wrong. I don鈥檛 personally write any go, so the errors might be an obvious oversight on my part.

Here are the two errors I get:

github.com/CosmWasm/wasmvm/api
# github.com/CosmWasm/wasmvm/api
vendor/github.com/CosmWasm/wasmvm/api/mock_failure.go:15:27: undefined: GoAPI
vendor/github.com/CosmWasm/wasmvm/api/mocks.go:192:2: undefined: GasMeter
vendor/github.com/CosmWasm/wasmvm/api/mocks.go:193:20: undefined: Gas

and

app/app.go:10:2: cannot find package "." in:
        /build/source/vendor/github.com/regen-network/regen-ledger/types/module
app/app.go:95:2: cannot find package "." in:
        /build/source/vendor/github.com/regen-network/regen-ledger/types/module/server
app/app.go:96:2: cannot find package "." in:
        /build/source/vendor/github.com/regen-network/regen-ledger/x/ecocredit
app/app.go:11:2: cannot find package "." in:
        /build/source/vendor/github.com/regen-network/regen-ledger/x/ecocredit/module

I wrote up actual issues and created reproduction repos for these:

Any advice, posts / materials on these kinds of issues, or obvious fixes would be greatly appreciated!