Some mas-cli commands like mas account and mas listare working fine. But when I try to run mas outdated or mas upgrade I get the following error:

(base) ➜  ~ mas outdated
2021-03-25 04:15:53.204 mas[26314:2574999] INFO: fetch-response is unable to open the file /Users/<username>/Library/Caches/com.mphys.mas-cli/fsCachedData/0BC3AC3D-...-...-...-FB47D8BEEF7C. Errno: 2
(base) ➜  ~ mas upgrade
2021-03-25 04:15:53.204 mas[26314:2574999] INFO: fetch-response is unable to open the file /Users/<username>/Library/Caches/com.mphys.mas-cli/fsCachedData/0BC3AC3D-...-...-...-FB47D8BEEF7C. Errno: 2
Warning: Nothing found to upgrade
(base) ➜  ~

I would have to wait until one of my apps gets an update to check whether mas upgrade is actually working.
As recommended, I ran mas reset several times after restarting my machine and logging out and back into the App Store. Nothing worked.

I'm running macOS Big Sur 11.2.3 on a MacBook Pro (13-inch, 2017). I installed mas-cli via Homebrew, and the last time I used mas-cli was last week. Likewise, I run brew update && brew upgrade, and then brew cleanup && brew doctor every day, so maybe it's due to a recent update. But I always get Your system is ready to brew. when running the doctor command.