When you deploy a redis service, you don't have the option to define the entrypoint of the service yourself. This is not a problem when you just use redis, but when you use redis stack, the entrypoint used by easy panel does not load the redis stack add-ons like the entrypoint.sh file in the official redis/redis-stack image would. This means that features like redis om are not active because they were not loaded when the redis server was launched.