trap_exit cannot trap signal when exit/1 doesn't called explicitly

[lang er]

I write another small module, It works well, so what's wrong with
link_demo?


-module(dd).

-export([test/0,test1/0]).

test() ->
    process_flag(trap_exit, true),
    link(spawn(dd, test1,  [])),
    t().

test1() ->
    ok.
t() ->
    receive
        Any ->
                    io:format("~w~n",[Any])
    end.


> Thanks!
> Best Regards
> James
>
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