The /worldbuilder command doesn't work.

With Education Edition turned on in the cheats menu, I wanted to test the /worldbuilder command for another world I'm making. Even with /immutableworld on both true and false,  /ability @s worldbuilder false and /worldbuilder do not change the building/breaking block permissions. Please fix!

Steps to Reproduce:
1. create a world with Education Edition features enabled in the cheats menu
2. run the /immutableworld true command 
3. run the /ability @s worldbuilder false command
Observed Results:
All commands run without issue and expected command output messages are sent, but the player still has the ability to build and break blocks.
Expected Results:
All commands run without issue and expected command output messages are sent and the player doesn't have the ability to build and break blocks.