CustomDriveItemItemRequestBuilder doesn't delete Permissions

The CustomDriveItemItemRequestBuilder doesn't do what DriveItemItemRequestBuilder can do.

Ex:

        var site = $"{options.Host}:/sites/{options.SiteName}";
        _site ??= await graphServiceClient.Sites[site].GetAsync();
        var drive = await graphServiceClient.Sites[_site?.Id].Drive.GetAsync();
        var item = await graphServiceClient.Drives[drive?.Id].Root.ItemWithPath(root + path).GetAsync();

        DriveItemItemRequestBuilder folder = await graphServiceClient.Drives[drive?.Id].Items[item?.Id];

        await folder.Permissions[permission.Id].DeleteAsync();

With permission.Id being gotten from Graph API already (with value of like YzowdC5jfHRlbmFubHwtPYFxNWQwNi04NjDzLTRkNzctOWY4OS2mM1JmDMNMIWEzM2P works fine, but

        var site = $"{options.Host}:/sites/{options.SiteName}";
        _site ??= await graphServiceClient.Sites[site].GetAsync();
        var drive = await graphServiceClient.Sites[_site?.Id].Drive.GetAsync();

        CustomDriveItemItemRequestBuilder folder = graphServiceClient.Drives[drive?.Id].Root.ItemWithPath(root + path);

        await folder.Permissions[permission.Id].DeleteAsync();

doesn't work (ODataError : Item not found).

I expect DriveItemItemRequestBuilder to work the same as CustomDriveItemItemRequestBuilder as the only difference in being able to get one of these types is whether when getting a drive item, ItemWithPath() or Items[item.Id] is used and Permissions.DeleteAsync() exists on both.

Start by comparing CustomDriveItemItemRequestBuilder created through Root.ItemWithPath with DriveItemItemRequestBuilder created through Items[item.Id], focusing on the Permissions[permission.Id].DeleteAsync() request. Reproduce the ODataError: Item not found case and determine why the two builders address permissions differently; done means the path-based builder deletes the existing permission consistently.