Rust packaging issue: Unable to fetch git dependencies correctly

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I’m currently trying to package the rust application “Appflowy-Cloud” (GitHub - AppFlowy-IO/AppFlowy-Cloud: AppFlowy is an open-source alternative to Notion. You are in charge of your data and customizations. Built with Flutter and Rust.)
It includes some git dependencies from another repository in the Cargo.toml via a crates.io-patch like this:

[dependencies]
collab = { workspace = true }
collab-document = { workspace = true }
collab-entity = { workspace = true }
collab-folder = { workspace = true }

[...]

[workspace.dependencies]
collab = { version = "0.2.0" }
collab-entity = { version = "0.2.0" }
collab-folder = { version = "0.2.0" }
collab-document = { version = "0.2.0" }

[...]

[patch.crates-io]
# It's diffcult to resovle different version with the same crate used in AppFlowy Frontend and the Client-API crate.
# So using patch to workaround this issue.
collab = { git = "https://github.com/AppFlowy-IO/AppFlowy-Collab", rev = "870cd70" }
collab-entity = { git = "https://github.com/AppFlowy-IO/AppFlowy-Collab", rev = "870cd70" }
collab-folder = { git = "https://github.com/AppFlowy-IO/AppFlowy-Collab", rev = "870cd70" }
collab-document = { git = "https://github.com/AppFlowy-IO/AppFlowy-Collab", rev = "870cd70" }

This is my derivation:

{
  lib,
  rustPlatform,
  fetchFromGitHub,
  pkg-config,
  protobuf,
  openssl,
  sqlite,
  zstd,
}:
rustPlatform.buildRustPackage rec {
  pname = "appflowy-cloud";
  version = "0.5.3";

  src = fetchFromGitHub {
    owner = "AppFlowy-IO";
    repo = "AppFlowy-Cloud";
    rev = version;
    hash = "sha256-bFonlXrd7MFSYEtGsDoO307KSDntiB2vQcdKC68hvcc=";
  };

  cargoLock = {
    lockFile = ./Cargo.lock;
    outputHashes = {
      "collab-0.2.0" = "sha256-3Y2UrAga7wiV5RF+Lj0PkWA6gsa2h/PkRVUnjbrepqc=";
    };
  };

  nativeBuildInputs = [
    pkg-config
    protobuf
  ];

  buildInputs = [
    openssl
    sqlite
    zstd
  ];
}

When I try to build the derivation, i get the following error:

 Caused by:
   Unable to update https://github.com/AppFlowy-IO/AppFlowy-Collab?rev=870cd70#870cd70e
 Caused by:
   failed to update replaced source https://github.com/AppFlowy-IO/AppFlowy-Collab?rev=870cd70#870cd70e
 Caused by:
   failed to parse manifest at `/build/cargo-vendor-dir/collab-document-0.2.0/Cargo.toml`
 Caused by:
   error inheriting `collab` from workspace root manifest's `workspace.dependencies.collab`
 Caused by:
   failed to find a workspace root

Apart from this similiar issue on nixpkgs, which is unfortunateley still not fixed, I haven’t found anything related to nix about this.
I’d appreciate any idea on how to fix this