Undeterministic behavior when there is a package and package instantiation with the same name

[m-kru]

file1.vhd

package float_pkg is new IEEE.float_generic_pkg
  generic map (
    float_exponent_width => 8,    -- float32'high
    float_fraction_width => 23,   -- -float32'low
    float_round_style    => IEEE.fixed_float_types.round_nearest,  -- round nearest algorithm
    float_denormalize    => true,  -- Use IEEE extended floating
    float_check_error    => true,  -- Turn on NAN and overflow processing
    float_guard_bits     => 3,     -- number of guard bits
    no_warning           => false, -- show warnings
    fixed_pkg            => IEEE.fixed_pkg
    );

file2.vhd

package float_pkg is
  function to_string (value : UNRESOLVED_float) return STRING;
end package float_pkg;

Output

[user@host test]$ thdl doc to_string
vhdl:work.float_pkg.to_string

float_pkg_c.vhd

function to_string (value : UNRESOLVED_float) return STRING;
[user@host test]$ thdl doc to_string
found no symbol matching path 'to_string'