Hi @TurtlesDownards ,
As you said, the RLS role does not work for members with workspace edit permissions. It is possible that this user has not been successfully added to the RLS role, you can see the added members in the following image.
Also not all types of groups can be added to the role. For example, Office 365 groups. And check the documentation for Considerations and limitations to rule out these causes.
If the problem is still not resolved, point it out. Looking forward to your reply.
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.