/setmaxplayers not available on downloaded worlds from realms

Downloading a world off your realm will rid the use of the /setmaxplayers command.

I downloaded a world off of my realm the other day. Then, I open the local world. Then, typing in the command: /setmaxplayers 'argument', I found that the command does not exist.

My assumption is that this command is taken away when on realms, because realms are only limited to '2 or 10 players', and using the setmaxplayers command would overwrite that. However, I guess there isn't a system that brings back the tag when downloading the world off the realm.

Cheats are enabled

https://youtu.be/z0ciJa_mP7o

Steps to Reproduce

1. Create a world (With cheats enabled)
2. Join the world and make sure the /setmaxplayers command works in the first place.
3. Upload the world to your realm.
4. Make sure cheats are enabled on your realm.
5. Join the world
6. Leave, then download the world off of your realm. (This will put the world hosted on your realm back into your worlds tab)
7. Make sure cheats enabled is still on.
8. Join the downloaded world
9. Type in the setmaxplayers command.

Observed Result
The command doesn't exist anymore