Dart-Code: Completions for Flutter (and other) libraries are missing if packages were fetched after opening the project

During a recent live stream, I noticed that I was having some performance issues (Opened a separate issue on this one). Due to an unrelated issue, I downgraded my flutter channel from dev to stable. After doing this, I noticed that any imported libraries were not receiving auto completion anymore. I went back up to dev after a day or two and I am still not receiving proper auto-completion for these imported libraries. Sometimes this even happens with Flutter libraries like Foundation and Cupertino.

I find that if I’ve already imported the library via pubspec and imported it into the file; I can close out of the editor and it will give me the expected auto-completion.

This is a bit of a strange issue in that it seems to be very selective. For instance, when I was working with the Android Alarm Manager library, typing in the object AndroidAlarmManager did not give me auto-completion, however I was able to get auto completion for the attached methods/named constructors. Even typing in the object name again did not yield auto-completion either which again was a bit strange. On the other hand, a library like the http library didn’t have this problem. I can provide a log if needed; tomorrow, I plan to sit down and do some heavy coding.