My recent observation is not appearing in a collection project and there does not appear to be any reasoning for it. The location of the observation is well within the boundary box of the project and it also meets the date requirements. (no other exclusions or requirements are set). When editing the project and clicking “preview observations” the observation appears there, however it does not appear on the actual project page on desktop or mobile.
Observation was submitted on desktop at the same time as other observations taken at the same location on the same day and they appear with no problem.