`FROM` statement does not get parsed correctly when using variable substitution

[ShauryaAg]

ARG cloud
FROM ${cloud:-"mcr.microsoft.com/azure-cli:latest"}python

Getting the following error when parsing the above Dockerfile using devcontainers

Error: Command failed: docker inspect --type image :-
    at createSetupError (D:\Documents\Projects\devcontainers\cli\dist\spec-node\devContainersSpecCLI.js:66588:73)
    at openDockerfileDevContainer (D:\Documents\Projects\devcontainers\cli\dist\spec-node\devContainersSpecCLI.js:66584:11)
    at async resolveWithLocalFolder (D:\Documents\Projects\devcontainers\cli\dist\spec-node\devContainersSpecCLI.js:66964:14)
    at async launch2 (D:\Documents\Projects\devcontainers\cli\dist\spec-node\devContainersSpecCLI.js:67020:18)
    at async doProvision (D:\Documents\Projects\devcontainers\cli\dist\spec-node\devContainersSpecCLI.js:69093:20)
    at async provision (D:\Documents\Projects\devcontainers\cli\dist\spec-node\devContainersSpecCLI.js:69078:18)
{"outcome":"error","message":"Command failed: docker inspect --type image :-","description":"An error occurred setting up the container."}