I placed a glass pane next to a slimeblock and it didn't connect, despite slimeblocks being solid blocks. I then placed a fence next to a slimeblock and it did connect.
It turns out that (stained) glass panes and iron bars don't connect to blocks that are solid, but graphically transparent. The only blocks that have this property are: Slimeblock, endportalframe and mobspawner.
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I've just tested it in 16w04a, and it appears to be fixed for Slime Blocks and Spawners, but still applies to End Portal Frames.
Confirmed. Maybe intended though.