Printing the supports every layer everything is just fine.
Combining supports every 2nd layer the dense supports are missing.
Certainly, the supports then are just printed every 2nd layer and every other one is skipped and if being a dense support just missing.
And still, in my understanding the combining of support layers is for saving time where quality is of no concern.
But where there are certain layers (dense at bottom and top are determined) they should be printed,
no matter what settings for the raw support structure in between.
Just an idea of mine, I can handle that behaviour, if neccessary with multiple processes.
Not sure if this is only in 4.1.1 (which by the way now gives quite pretty prints )
but I rather believe this was already in the previous version.