platform linux/amd64 on Apple Silicon stops on dotnet restore

I am trying to build a docker image on a MacBook pro that has the M1 Max processor. The project is a .NET Blazor application. Here is the docker file:

FROM mcr.microsoft.com/dotnet/aspnet:7.0 AS base
WORKDIR /app
EXPOSE 80
EXPOSE 443

FROM mcr.microsoft.com/dotnet/sdk:7.0 AS build
WORKDIR /src
COPY ["WebApi/WebApi.csproj", "WebApi/"]
RUN dotnet restore "WebApi/WebApi.csproj"
COPY . .
WORKDIR "/src/WebApi"
RUN dotnet build "WebApi.csproj" -c Release -o /app/build

FROM build AS publish
RUN dotnet publish "WebApi.csproj" -c Release -o /app/publish

FROM base AS final
WORKDIR /app
COPY --from=publish /app/publish .
ENTRYPOINT ["dotnet", "WebApi.dll"]

If I build using this command:

docker buildx build -f WebApi/Dockerfile .

The build works fine and creates an arm64 image that runs in docker desktop on my MacBook.

If I build using this command to try to build an amd64 image:

docker buildx build --platform linux/amd64 -f WebApi/Dockerfile .

It hangs up when the build gets to this command:

dotnet restore "WebApi/WebApi.csproj"

Start by reproducing the linux/amd64 build with docker buildx using WebApi/Dockerfile and observe the dotnet restore step. Compare it with the successful default-platform build and inspect the .NET SDK restore behavior under the amd64 build. Done means the amd64 image build completes past restore and produces a usable image.