first of all please apologize my super late response. Meanwhile my Macbook Pro has been destroyed by my cat by spilling a whole cup of coffee on it...
And I got to my desktop computer just yesterday.
Anyway, I can confirm the Clock app freezes on my Windows 10, RTX3080, FlowerPot, OS4.1 update 2.
However it does not happen all the time. Sometimes I am able to launch and close the clock app several times before it freezes, sometimes it freezes on the first run, or when I resize the app window. Very strange, indeed.
Can you please confirm that on your side the freeze ALWAYS happens on the first launch of the Clock app?
Also, can you confirm it ALWAYS works in Amiga Forever? Especially if you repeatedly launch, resize and close the Clock app?