No worries. Lemmy's interface is certainly different, you'll have to do a bit of stumbling at first. And Lemmy itself is still maturing and the federation features are always going to have a sort of disjointedness.
Most likely, no one on this instance ever searched for that community so there's no record in the database when you searched. This prompts the instance to start looking at other instances which often takes more time than the timeout on the search results. The good news is that the search continues in the background and the local instance database will be updated with a match. So the easiest solution is to wait a minute or two and search for https://programming.dev/c/meta again. It with likely show right up.
FYI you don't need to go to the communities page to search. On the top of every page is a search link (on mobile it's revealed from the menu icon on the upper right).