Issue with Plugin Commands Not Executing in Game from Procedure Blocks

I am currently using version 2024.4 / 1.20.1 for my modding environment.

I've encountered a problem where using the [Execute Command / ( ) in the name of Event/target entity] block to execute external scripts or plugin commands only works in the console. Does anyone else experience this issue?

While vanilla commands like /gamemode survival work perfectly, plugin commands like /sit or /speed only execute in the console. Previously, I used version 2020.5 and did not encounter this issue. Any insights or solutions would be greatly appreciated.