ExUnit: Fails to correctly highlight diffs in tuples with lists in them

[Munksgaard]

Elixir and Erlang/OTP versions

$ elixir --version
Erlang/OTP 25 [erts-13.2.2.5] [source] [64-bit] [smp:8:8] [ds:8:8:10] [async-threads:1] [jit:ns]

Elixir 1.16.1 (compiled with Erlang/OTP 25)

Operating system

NixOS

Current behavior

Here is my test file:

defmodule HighlightingTest do
  use ExUnit.Case, async: true

  test "correct1" do
    val = {[:foo]}
    assert ^val = {[:bar]}
  end

  test "correct2" do
    val = [:foo]
    assert ^val = [:bar]
  end

  test "correct3" do
    val = {:foo}
    assert ^val = {:bar}
  end

  test "incorrectly colored" do
    val = [{:foo}]
    assert ^val = [{:bar}]
  end
end

And here is the colored output I get from running mix test on the file:

Notice that in the last test the entire {:bar} is highlighted in green, instead of just :bar, as in the rest of the tests.

Expected behavior

Only :bar is highlighted.