What do you mean that many cases in 2018 are already closed, maybe you mean- early 2018 applicants only. Those who applied April 2018 onwards have the same fate.I did my medical in January, already in 23th month. I called CIC, but they can only request information about my file and send it in 1 month. On other hand I see that many cases from 2018 are already closed. I think that it is very unfair to treat people like this, I find it discriminatory.
But I can feel you, getting the MR on your 23rd month is really frustrating. But who knows, maybe your other checks, Background, Security among others are already done. Maybe after your Medical passed, you’ll get your PR immediately in days. Just continue praying. Hoping for the best and good luck!