Blorp dev here. Comment are virtualized. That means anything that isn’t currently in view can get unmounted to keep the comments page super snappy. For small posts, this is definitely overkill, but it means we can smoothly render posts with thousands of comments.

I’ve kinda been waiting for someone to complain about this for me to fix it. What I’ll likely do is implement a custom search box that is compatible with the virtualized comments. I have a lot on my plate rn, but I’ll get this fixed as soon as I have time. Sorry for the inconvenience.