That's ridiculous. Seems that Q4 2018 and Q1 2019 applicants are totally forgotten.Hey, my case is similar as well! I applied for federal on October 2018, I received pre arrival on March 2020 and passed medical last year on Nov. Medical results was my last update! By the way I am inland applicant!!!! I contacted several times to IRCC and agents just said due to covid you should wait! But is the covid only for 2018-19 applicants?!!!
Btw, I also got pre-arrival on March 2020 - It is the period when Covid precautions have officially started in Canada.
Maybe workers have had to left their offices when Covid started while they were working on our batch of files (late 2018-early 2019).
And then when they've returned back, they did not continue from our files but 2020.