Describe the bug
When trying to fix the npcs on a certain angle through rotation lock, it only works until you leave the game. when you re-join your game, the NPC's Rotation Lock is not applied, so they move through different angles as they try to look at a player with a rotation applied on it.

To Reproduce
Steps to reproduce the behavior:

1. Go to 'NPC's Setting page, Rotation, then set the npcs rotation angle to ur desired angle'
2. Click on 'Lock' at the NPC's rotation page
3. You can see it is applied for the time being, but when you re-join the game the rotation lock is no longer applied if u check again.

Thanks for the report. I'm already aware about this, see: #50