Yes, it does filter out those invalid devices.
I believe the max number of supported devices is 36 per expander. See here:
http://www.avagotech.com/products/server-storage/sas-expanders/sas-2x36
I also ran the latest version on my 2nd server. The output looks good here as well:
Going back the my primary server, here are a couple of screenshots from the controller web interface.
Hardware info:
SAS expander info:
Drive location info:
The 8 SSD drives are directly connected to the 1882 controller via SFF-8087 to SATA fan out cables. The 24 other drives are connected via the LSI SAS2 expander on the SuperMicro backplane.
Same info for my 2nd server as follows:
SAS expander info:
Note that this server is comprised of 3 chassis, all of which have a LSI SAS2 x36 expander in them. Chassis/expander 1 is connected via the internal SFF-8087 connector. Chassis 2 is connected via the external SFF-8088 connector. Chassis 3 daisy-chained through chassis 2.
Drive location info:
Note that in the device column, the labels are all Slot 01 - Slot 24 for all 3 chassis. In my other server, the drives hanging off the SAS expander are labeled PHY#12 - PHY#35. This is due to that particular SAS2 backplane being a slightly older hardware revision. My friend with a pair of Areca 1880 controllers and a very similar setup with 4 SuperMicro 846 chassis, is noticing the exact same behavior. He has been running these beta versions as well, and it seeing the same improvements as I am.