Radius data tag not working

After the 1.1.3.1 update on MCPE, I tried fidgeting around command blocks. I was testing this new command by a youtuber then it involved setting the radius for the command to take effect. I was surprised to know that the radiis data tag or [r=number] doesn't seem to work as intended, and I can't finish the command without it. I have commented on the said video and realized that other people seem to encounter this problem as well.