(Idk how known these issues are but i thought i'd make this post anyway)
-Encased fans don't process items when they are facing down, targeting a depot or belt. (They work when they blow horizontally over depots and belts.)
-They don't process dropped items and they don't blow entities away.
-Blocks that are considered transparent on regular minecraft terrain, like campfires and windmill sail frames behave differently on vs ships: Campfires are not transparent vertically, only horizontally (On land they are transparent in all directions), sail frames are not transparent in any directions on ships, while they are on land.
I play on 1.20.1 fabric, tried all these problems on both the 0.5.1f and 0.5.1j versions of create, only difference was that the j patch didn't render the items on belts but since that version isn't officially supported i don't mind that.
Attached mod list