Multiple Lemmy apps serve the first ‘page’ of posts fine - even new posts or updates - but upon scrolling and requesting the next page, Boost gives an error message “timeout”, and Blorp just doesn’t load anything else (per app implementation, I know).

UPDATE: Another user mentioned that if you sort by Top instead of New/Hot/Active, infinite scroll works, and it does.

Thanks @AChiTenshi@sh.itjust.works