Why this panics? "fatal runtime error: thread local panicked on drop"

this-panics.rs

struct MyThreadWrapper {
    thread: Option<std::thread::JoinHandle<()>>,
}
impl Drop for MyThreadWrapper {
    fn drop(&mut self) {
        if let Some(thread) = self.thread.take() {
            let _ = thread.join();
        }
    }
}

thread_local! {
    static THREAD2: MyThreadWrapper =
        MyThreadWrapper { thread: Some(std::thread::spawn(|| {
            println!("Does this work");
        }))};
}

fn main() {
    THREAD2.with(|_| {
        
    });
}

/*
THIS HAPPENS USUALLY, BUT NOT ALWAYS, I THINK THIS IS SOME RACE CONDITION:

thread 'main' panicked at 'called `Option::unwrap()` on a `None` value', /rustc/f3126500f25114ba4e0ac3e76694dd45a22de56d\library\std\src\thread\mod.rs:1458:40
stack backtrace:
   0: std::panicking::begin_panic_handler
             at /rustc/f3126500f25114ba4e0ac3e76694dd45a22de56d/library\std\src\panicking.rs:575
   1: core::panicking::panic_fmt
             at /rustc/f3126500f25114ba4e0ac3e76694dd45a22de56d/library\core\src\panicking.rs:64
   2: core::panicking::panic
             at /rustc/f3126500f25114ba4e0ac3e76694dd45a22de56d/library\core\src\panicking.rs:114
   3: std::thread::JoinHandle<T>::join
   4: <core::panic::unwind_safe::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once
   5: std::thread::local::fast::Key<T>::try_initialize
   6: std::sys::windows::thread_local_dtor::run_keyless_dtors
             at /rustc/f3126500f25114ba4e0ac3e76694dd45a22de56d/library\std\src\sys\windows\thread_local_dtor.rs:28
   7: std::sys::windows::thread_local_key::on_tls_callback
             at /rustc/f3126500f25114ba4e0ac3e76694dd45a22de56d/library\std\src\sys\windows\thread_local_key.rs:246
   8: RtlGetCurrentDirectory_U
   9: RtlActivateActivationContextUnsafeFast
  10: LdrShutdownThread
  11: LdrShutdownProcess
  12: RtlExitUserProcess
  13: ExitProcess
  14: exit
  15: exit
  16: __scrt_common_main_seh
             at D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:295
  17: BaseThreadInitThunk
  18: RtlUserThreadStart
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
fatal runtime error: thread local panicked on drop

*/