Does nvc correctly dump enum arrays to .fst

[m-kru]

VHDL example:

entity test is end entity;

architecture enum_test of test is

  type state_t is (ONE, TWO, THREE);
  type state_array_t is array (0 to 1) of state_t;
  signal states : state_array_t := (others => ONE);

begin

  main : process begin
    wait for 2 ns;
    states(0) <= TWO;
    wait for 2 ns;
    states(1) <= TWO;
    wait for 2 ns;
    states(0) <= THREE;
    wait for 2 ns;
    std.env.finish;
  end process;

end architecture;

Run it with:

nvc -a test.vhd
nvc -e test
nvc -r test --wave --dump-arrays

This is what I can see in GTKWave:

And this is what I can see in Surfer:

I guess there should be two lines. One for each state.

At first, I thought that both GTKWave and Surfer have similar bug. However, Kevin Laeufer in the following issue Surfer#474 suggested that this might be a bug in nvc.