So I have played for a few weeks, and its been hella fun. Cant believe that im that late to the MC party but better late than never right.

So I decided to make one of those mobgrinders in the sky that gives you drops from skellys, spiders, zombies etc and I have 1 problem. It does not spawn anything at all, and if it does spawn something then its like 3 mobs per 5 min.

The Trapdoor Design here is built exactly the same as in this video.

Y- 215

Its far away from any land or spawnable areas. Im staying withing 128 block radius at all times but even when im within 30 block radius, it does not work. The light levels are 0, The F3 function shows 0 entities when looking towards the grinder and overall im very dissappointed now.

Is this grinder outdated, did the AI change? Do I need a special system in place or am I just very unlucky?