fetchFromGithub doesn't work with fetchSubmodules when using tag as rev

[nh2]

I'm trying

  src = fetchFromGitHub {
    owner = "KDAB";
    repo = "hotspot";
    rev = "v1.0.0";
    sha256 = "09ly15yafpk31p3w7h2xixf1xdmx803w9fyb2aq7mhmc7pcxqjsx";
    fetchSubmodules = true;
  };

But when building I just get Bad commit hash or bad reference..

It works when I change to an explicit SHA (rev = "352687bf620529e9887616651f123f922cb421a4";).

It also works when I remove fetchSubmodules = true;.

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CC @copumpkin; original support for fetchSubmodules in fetchFromGithub was added in #15559

[nh2]

You're right, it's a duplicate.