Hello Ikari Man,
Thanks for reporting this in! Turns out it is a bug with the script calls used in the Reward Common Event.
We have the solution outlined here: https://itch.io/post/10452898
Please implement the fix on your end and let us know if you are still running into this issue. If so, we will continue to troubleshoot with you until it is resolved :)
Thanks,
MythAtelier Team