What do you mean by "blocked"? Bricked?
I tried clicking on an app in the store that requires Big Sur (I have Catalina). It has a download button but it gives me a message that I cannot install it because it requires MacOS 11. This seems to be different from what you are seeing.
When I look at Numbers in the app store, the button says "open".
If your Numbers app is "bricked", you might try deleting it then go to your account in the app store (where all your previous purchases are listed) and download it from there if you cannot download it like a new app. I assume it will let you download a previous version that way. I hope.