I finished my debugging and made it a blog on my website: Debugging Silverbullet not Loading - How to peel off the onion of cache ☁️ Live my life consciously
So it was really incurred by timeout. But I find it interesting that SB update is very dependent on the browser caches/cloudflare caches.
I think I might open a new topic the other day to introduce what I found to other people in the community.