Script not working

[Mamba]

on region enter:
    if "%region at player%" contains "setpat":
        set gamemode of player to spectator

There are no errors, the player is simply not given a gamemode

 

[Fusseldieb]

Doing a quick Forum search I found this:
https://forums.skunity.com/threads/on-region-enter.10784/#post-46589

Apparently you need to wait a little bit after doing the region enter check:

on region enter:
    wait 2 ticks
    if "%region at player%" contains "setpat":
        set gamemode of player to spectator

Tested on my server with WorldGuard and it works