Glass pans & iron bars connected to glass in 1.11.2. Now, in 17w18b (and possibly earlier... I haven't checked) they don't connect to glass anymore.
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MC-117015
Glass panes & iron bars no longer connect to glass
Resolved
Fixed
4
SuperGeniusZeb
migrated
Confirmed
glass, glass_pane, iron_bars
Minecraft 17w18b
Minecraft 1.12 Pre-Release 1
Retrieved